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Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1977
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000# 0.000# 0.000# 0.000 0.000 0.000 28.05 & 57.77 $ 116.7 " 29.76 & 361.4 " 0.000 1
2 0.000# 0.000# 0.000# 0.000 0.000 0.000 27.19 & 130.4 # 101.3 " 35.85 $ 407.2 " 0.000 2
3 0.000# 0.000# 0.000# 0.000 0.000 0.000 35.59 $ 205.3 " 86.15 # 37.08 $ 311.8 " 0.000 3
4 0.000# 0.000# 0.000# 0.000 0.000 0.000 34.06 $ 167.4 " 74.99 # 48.16 $ 202.0 " 0.000 4
5 0.000# 0.000# 0.000# 0.000 0.000 0.000 34.83 $ 161.0 " 67.16 # 44.88 $ 135.3 " 0.000 5
6 0.000# 0.000# 0.000# 0.000 0.000 0.000 34.87 $ 132.9 " 61.53 # 40.88 $ 93.27 # 0.000 6
7 0.000# 0.000# 0.000# 0.000 0.000 0.000 37.24 $ 107.1 " 64.72 # 35.14 $ 67.99 # 0.000 7
8 0.000# 0.000# 0.000# 0.000 0.000 0.000 36.73 $ 164.6 " 76.38 # 30.59 & 50.27 $ 0.000 8
9 0.000# 0.000# 0.000# 0.000 0.000 0.000 32.69 $ 318.4 " 67.76 # 29.10 & 44.00 $ 0.000 9
10 0.000# 0.000# 0.000# 0.000 0.000 0.000 29.92 $ 462.0 " 66.05 # 32.54 $ 39.39 $ 0.000 10
11 0.000# 0.000# 0.000# 0.000 0.000 0.013& 28.58 & 945.6 " 59.59 # 34.70 $ 35.02 $ 0.000 11
12 0.000# 0.000# 0.000# 0.000 0.000 13.22 & 28.03 &1609 " 58.26 # 25.99 & 27.77 & 0.000 12
13 0.000# 0.000# 0.000# 0.000 0.000 49.41 & 29.77 $1442 " 59.07 # 22.21 & 19.50 & 0.000 13
14 0.000# 0.000# 0.000# 0.000 0.000 50.08 $ 30.52 $1035 " 52.36 $ 20.61 & 14.24 & 0.000 14
15 0.000# 0.000# 0.000# 0.000 0.000 63.04 $ 34.86 $ 850.1 " 50.06 $ 17.91 & 11.85 & 0.000 15
16 0.000# 0.000# 0.000# 0.000 0.000 115.3 # 32.47 $ 667.1 " 46.18 $ 14.92 & 10.29 & 0.000 16
17 0.000# 0.000# 0.000# 0.000 0.000 111.2 " 49.65 $ 484.7 " 46.82 $ 13.91 & 7.576& 0.000 17
18 0.000# 0.000# 0.000# 0.000 0.000 111.7 " 71.13 # 391.8 " 45.97 $ 12.51 & 6.336& 0.000 18
19 0.000# 0.000# 0.000# 0.000 0.000 84.50 # 101.4 # 409.1 " 45.82 $ 11.46 & 4.199& 0.000 19
20 0.000# 0.000# 0.000# 0.000 0.000 65.46 # 110.2 " 441.0 " 40.83 $ 10.82 & 2.821& 0.000 20
21 0.000# 0.000# 0.000# 0.000 0.000 58.53 # 144.1 " 410.1 " 36.14 $ 9.020& 1.896& 0.000 21
22 0.000# 0.000# 0.000# 0.000 0.000 47.90 $ 188.3 " 398.4 " 36.16 $ 7.700& 1.205& 0.000 22
23 0.000# 0.000# 0.000# 0.000 0.000 40.96 $ 152.5 " 332.4 " 35.76 $ 7.606& 1.347& 0.000 23
24 0.000# 0.000# 0.000# 0.000 0.000 33.91 $ 151.9 " 262.1 " 35.23 $ 5.594& 2.095& 0.000 24
25 0.000# 0.000# 0.000# 0.000 0.000 30.74 $ 127.0 " 222.5 " 34.00 $ 4.617& 0.893& 0.000 25
26 0.000# 0.000# 0.000# 0.000 0.000 31.67 & 100.1 " 200.7 " 32.02 $ 3.910& 0.276& 0.000 26
27 0.000# 0.000# 0.000# 0.000 0.000 30.28 $ 79.66 # 187.3 " 32.49 & 3.961& 0.057& 0.000 27
28 0.000# 0.000# 0.000# 0.000 0.000 27.48 & 65.30 # 165.2 " 32.76 $ 3.263& 0.001& 0.000 28
29 0.000# 0.000# 0.000 0.000 25.22 & 54.89 # 151.4 " 30.60 & 1.505& 0.000 0.000 29
30 0.000# 0.000# 0.000 0.000 24.40 & 48.84 $ 137.4 " 30.37 $ 243.0 & 0.000 0.000 30
31 0.000# 0.000 0.000 43.44 $ 126.1 " 440.4 " 0.000 31
Mean 0.000# 0.000# 0.000# 0.000 0.000 33.83 & 64.64 & 412.1 $ 54.11 & 41.28 & 62.00 & 0.000
Median 0.000# 0.000# 0.000# 0.000 0.000 28.88 & 37.24 & 262.1 $ 48.44 & 20.61 & 11.07 & 0.000
Maximum 0.000# 0.000# 0.000# 0.000 0.000 115.3 & 188.3 &1609 $ 116.7 & 440.4 & 407.2 & 0.000
Minimum 0.000# 0.000# 0.000# 0.000 0.000 0.000& 27.19 & 57.77 $ 30.37 & 1.505& 0.000& 0.000
Total 0.00# 0.00# 0.00# 0.00 0.00 1015 & 2004 &12775 $ 1623 & 1280 & 1860 & 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 56.32 & " ... Relative Uncertainty +/-10%
Ann. Median 0.000& # ... Relative Uncertainty +/-15%
Annual Total 20557 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 1609 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1978
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.00 0.00 12.05& 0.00 0.00 57.04# 932.0 " 1466 " 619.5 " 182.5 " 4.89& 0.00 1
2 0.00 0.00 17.40& 0.00 0.00 71.58# 804.6 " 1261 " 511.8 " 199.6 " 6.32& 0.00 2
3 0.00 0.00 17.49& 0.00 0.00 71.22# 513.6 " 1067 " 430.6 " 247.7 " 5.26& 0.00 3
4 0.00 0.00 11.58& 0.00 0.00 60.22# 381.1 " 968.8 " 387.5 " 607.3 " 3.53& 0.00 4
5 0.00 0.00 8.10& 0.00 0.00 56.14# 317.1 " 1055 " 333.5 " 484.7 " 4.06& 0.00 5
6 0.00 0.00 6.19& 0.00 0.00 54.84# 310.8 " 1785 " 292.5 " 305.1 " 3.79& 0.00 6
7 0.00 0.00 4.51& 0.00 0.00 58.04# 346.3 " 2261 " 259.9 " 218.7 " 2.46& 0.00 7
8 0.00 0.00 3.24& 0.00 0.00 77.82# 328.3 " 1478 " 232.3 " 169.3 " 1.99& 0.00 8
9 0.00 0.00 1.55& 0.00 0.00 74.99# 337.8 " 1013 " 243.1 " 135.4 " 1.63& 0.00 9
10 0.00 0.00 1.04& 0.00 0.00 74.61# 295.1 " 818.2 " 259.2 " 113.8 " 1.19& 0.00 10
11 0.00 0.00 0.22& 0.00 0.00 79.00# 239.6 " 737.9 " 334.0 " 95.36" 0.81& 0.00 11
12 0.00 0.00 0.04& 0.00 0.00 74.40# 215.1 " 658.7 " 380.7 " 79.13# 0.39& 0.00 12
13 0.00 0.00 0.00& 0.00 0.00 61.58# 225.3 " 606.2 " 386.0 " 69.47# 0.21& 0.00 13
14 0.00 0.00 0.00 0.00 0.00 52.86$ 245.8 " 566.1 " 398.1 " 59.34# 0.08& 0.00 14
15 0.00 0.00 0.00 0.00 0.00 53.33$ 824.7 " 535.2 " 329.0 " 51.34$ 0.01& 0.00 15
16 0.00 0.00 0.00 0.00 0.00 50.74$ 6831 " 534.5 " 423.2 " 46.10$ 0.00 0.00 16
17 0.00 0.00 0.00 0.00 50.71& 45.28$10458 " 770.4 " 332.8 " 40.71$ 0.00 0.00 17
18 0.00 0.00 0.00 0.00 161.1 $ 43.21$ 7689 " 818.8 " 288.7 " 36.05$ 0.00 0.00 18
19 0.00 0.00 0.00 0.00 185.8 " 42.43$ 6342 " 701.8 " 272.9 " 32.44$ 0.00 0.00 19
20 0.00 0.00 0.00 0.00 123.5 " 40.88$ 8582 " 735.7 " 251.9 " 28.59& 0.00 0.00 20
21 0.00 0.00 0.00 0.00 99.65" 43.28$14557 " 789.6 " 259.6 " 24.64& 0.00 0.00 21
22 0.00 11.31& 0.00 0.00 127.7 " 60.65$18442 " 751.2 " 243.8 " 21.27& 0.00 0.00 22
23 0.00 65.87# 0.00 0.00 299.2 " 97.83#11212 " 681.2 " 240.9 " 18.44& 0.00 0.00 23
24 0.00 61.18$ 0.00 0.00 192.9 " 165.3 " 6050 " 668.9 " 241.0 " 15.58& 0.00 0.00 24
25 0.00 43.84$ 0.00 0.00 121.9 " 233.2 " 5368 " 639.6 " 277.4 " 13.13& 0.00 0.00 25
26 0.00 32.05& 0.00 0.00 92.75# 716.2 " 8350 " 553.6 " 496.4 " 11.67& 0.00 0.00 26
27 0.00 22.12& 0.00 0.00 73.51# 822.6 " 5165 " 540.7 " 462.7 " 10.92& 0.00 0.00 27
28 0.00 16.03& 0.00 0.00 61.61# 638.8 " 3123 " 553.4 " 317.8 " 9.42& 0.00 0.00 28
29 0.00 0.00 0.00 57.58# 764.6 " 2552 " 529.7 " 240.6 " 8.02& 0.00 0.00 29
30 0.00 0.00 0.00 55.73$ 972.0 " 2033 " 491.1 " 190.3 " 7.05& 0.00 0.00 30
31 0.00 0.00 70.40# 1680 " 538.8 " 5.78& 0.00 31
Mean 0.000 9.014& 2.690& 0.000 57.23 & 190.5 $4024 " 857.3 " 331.3 " 108.0 & 1.220& 0.000
Median 0.000 0.000& 0.000& 0.000 0.000& 66.40 $1680 " 735.7 " 305.2 " 46.10 & 0.005& 0.000
Maximum 0.00 65.87& 17.49& 0.00 299.2 & 972.0 $18442 " 2261 " 619.5 " 607.3 & 6.32& 0.00
Minimum 0.000 0.000& 0.000& 0.000 0.000& 40.88 $ 215.1 " 491.1 " 190.3 " 5.779& 0.000& 0.000
Total 0.0 252.4& 83.4& 0.0 1774 & 5715 $124750 " 26576 " 9938 " 3349 & 36.6& 0.0
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 472.5 & " ... Relative Uncertainty +/-10%
Ann. Median 5.255& # ... Relative Uncertainty +/-15%
Annual Total 172473 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 18442 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1979
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 80.30 # 636.9 " 187.9 " 362.7 ! 57.26 ! 0.016! 0.000 1
2 0.000 0.000 0.000 0.000 0.000 69.10 # 527.4 " 168.3 " 307.1 ! 44.13 ! 0.006! 0.000 2
3 0.000 0.000 0.000 0.000 0.000 60.60 # 498.5 " 152.1 " 264.1 ! 34.56 ! 0.000! 0.000 3
4 0.000 0.000 0.000 0.000 0.000 56.15 # 456.2 " 137.4 " 231.5 ! 28.23 ! 0.000! 0.000 4
5 0.000 0.000 0.000 0.000 0.000 63.38 # 418.6 " 121.7 " 196.4 ! 21.16 ! 0.000! 0.000 5
6 0.000 0.000 0.000 0.000 0.000 71.86 # 412.1 " 105.0 " 171.7 ! 18.31 ! 0.000! 0.000 6
7 0.000 0.000 0.000 0.000 0.000 66.97 # 506.8 " 90.09 # 157.6 ! 15.01 ! 0.000! 0.000 7
8 0.000 0.000 0.000 0.000 0.000 58.42 # 648.9 " 76.50 # 147.7 ! 11.74 ! 0.000! 0.000 8
9 0.000 0.000 0.000 0.000 0.000 62.71 # 699.7 " 63.08 # 137.6 ! 8.987! 0.000! 0.000 9
10 0.000 0.000 0.000 0.000 0.000 103.7 # 821.8 " 52.15 $ 127.2 ! 7.777! 0.000! 0.000 10
11 0.000 0.000 0.000 0.000 0.000 243.7 " 817.8 " 45.06 $ 134.3 ! 8.270! 0.000! 0.000 11
12 0.000 0.000 0.000 0.000 0.000 670.1 " 682.6 " 39.16 $ 141.4 ! 7.704! 0.000! 0.000 12
13 0.000 0.000 0.000 0.000 0.000 503.0 " 612.4 " 32.64 $ 127.9 ! 6.197! 0.000! 0.000 13
14 0.000 0.000 0.000 0.000 0.000 411.9 " 570.0 " 25.30 & 106.0 ! 5.495! 0.000 0.000 14
15 0.000 0.000 0.000 0.000 0.000 306.3 " 552.1 " 18.75 & 102.1 ! 4.553! 0.000 0.000 15
16 0.000 0.000 0.000 0.000 0.000 235.1 " 604.9 " 14.20 & 102.4 ! 3.670! 0.000 0.000 16
17 0.000 0.000 0.000 0.000 0.000 239.7 " 667.9 " 106.2 ! 97.90 ! 2.539! 0.000 0.000 17
18 0.104& 0.000 0.000 0.000 0.000 280.1 " 682.0 " 492.4 ! 86.90 ! 2.401! 0.000& 0.000 18
19 46.99 & 0.000 0.000 0.000 0.000 401.4 " 656.3 "2166 ! 74.91 ! 2.056! 0.002& 0.000 19
20 34.87 $ 0.000 0.000 0.000 0.000 299.6 " 576.0 "4343 ! 62.82 ! 2.737! 0.004& 0.000 20
21 22.85 & 0.000 0.000 0.000 0.000 317.8 " 497.2 "4544 ! 71.47 ! 2.566! 0.032& 0.000 21
22 13.81 & 0.000 0.000 0.000 3.150& 310.1 " 420.9 "3051 ! 105.3 ! 1.847! 0.000& 0.000 22
23 8.573& 0.000 0.000 0.000 24.99 & 412.8 " 403.9 "1832 ! 158.5 ! 1.542! 0.000 0.000 23
24 4.403& 0.000 0.000 0.000 61.11 &1341 " 392.4 "1253 ! 233.5 ! 1.429! 0.000 0.000 24
25 3.230& 0.000 0.000 0.000 192.6 "1470 " 363.9 "1094 ! 226.8 ! 1.423! 0.000 0.000 25
26 1.570& 0.000 0.000 0.000 334.8 "1510 " 324.2 "1052 ! 172.8 ! 0.808! 0.000 0.000 26
27 0.692& 0.000 0.000 0.000 261.7 "1129 " 284.8 " 910.5 ! 170.4 ! 0.349! 0.000 0.000 27
28 0.294& 0.000 0.000 0.000 219.0 " 947.7 " 262.1 " 781.1 ! 147.4 ! 0.155! 0.000 0.000 28
29 0.005& 0.000 0.000 164.5 " 849.5 " 245.4 " 633.2 ! 108.5 ! 0.082! 0.000 0.000 29
30 0.000 0.000 0.000 127.2 " 777.5 " 228.7 " 530.5 ! 79.15 ! 0.145! 0.000 0.000 30
31 0.000 0.000 99.10 " 208.0 " 432.8 ! 0.084! 0.000 31
Mean 4.432& 0.000 0.000 0.000 48.01 & 445.0 # 505.8 " 792.0 ! 153.8 ! 9.781! 0.002! 0.000
Median 0.000& 0.000 0.000 0.000 0.000& 303.0 # 506.8 " 168.3 ! 139.5 ! 3.670! 0.000! 0.000
Maximum 46.99 & 0.000 0.000 0.000 334.8 &1510 # 821.8 "4544 ! 362.7 ! 57.26 ! 0.032! 0.000
Minimum 0.000& 0.000 0.000 0.000 0.000& 56.15 # 208.0 " 14.20 ! 62.82 ! 0.082! 0.000! 0.000
Total 137.4 & 0.00 0.00 0.00 1488 &13350 #15680 "24551 ! 4614 ! 303.2 ! 0.06! 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 164.7 ! ! ... Not reviewed / Quality not known
Ann. Median 0.000! " ... Relative Uncertainty +/-10%
Annual Total 60124 ! # ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
Maximum Minimum & ... Relative Uncertainty +/-30%
Daily 4544 ! 0.000!
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1980
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 21.15 & 277.5 " 293.8 " 127.5 " 14.75 & 19.56 & 0.000 1
2 0.000 0.000 0.000 0.000 0.000 22.45 & 237.3 " 264.2 " 106.6 " 14.83 & 18.14 & 0.000 2
3 0.000 0.000 0.000 0.000 0.000 19.06 & 358.3 " 223.8 " 88.48 # 13.24 & 14.84 & 0.000 3
4 0.000 0.000 0.000 0.000 0.000 34.03 & 277.0 " 227.1 " 84.43 # 11.82 & 12.88 & 0.000 4
5 0.000 0.000 0.000 0.000 0.000 35.02 $ 204.6 " 222.6 " 76.30 # 10.24 & 12.12 & 0.000 5
6 0.000 0.000 0.000 0.000 21.15 & 37.04 $ 161.6 " 210.0 " 67.26 # 10.13 & 20.54 & 0.000 6
7 0.000 0.000 0.000 0.000 33.95 & 33.30 $ 135.2 " 193.2 " 64.75 # 9.087& 59.70 $ 0.000 7
8 0.000 0.000 0.000 0.000 19.22 & 28.20 & 114.5 " 162.8 " 60.39 # 7.123& 43.03 $ 0.000 8
9 0.000 0.000 0.000 0.000 24.11 & 24.68 & 105.4 " 164.1 " 58.08 # 5.034& 26.58 & 0.000 9
10 0.000 0.000 0.000 0.000 33.77 & 20.08 & 110.9 " 206.2 " 51.53 $ 4.368& 18.57 & 0.000 10
11 0.000 0.000 0.000 0.000 28.88 & 16.63 & 192.6 " 198.4 " 43.00 $ 4.444& 12.09 & 0.000 11
12 0.000 0.000 0.000 0.000 13.66 & 13.86 & 318.1 " 181.0 " 38.55 $ 5.128& 9.971& 0.000 12
13 0.000 0.000 0.000 0.000 8.230& 13.27 & 356.3 " 188.0 " 36.14 $ 5.223& 8.470& 0.000 13
14 0.000 0.000 0.000 0.000 7.412& 14.60 & 405.7 " 180.7 " 29.77 & 4.219& 6.451& 0.000 14
15 0.000 0.000 0.000 0.000 5.803& 15.64 & 434.1 " 137.2 " 33.68 $ 8.156& 4.448& 0.000 15
16 0.000 0.000 0.000 0.000 3.677& 17.15 & 437.6 " 110.3 " 27.07 & 235.1 & 2.674& 0.000 16
17 0.000 0.000 0.000 0.000 3.257& 22.45 & 389.5 " 100.5 " 25.76 & 150.0 " 2.159& 0.000 17
18 0.000 0.000 0.000 0.000 2.757& 19.52 & 330.6 " 98.64 " 24.05 & 214.6 # 1.297& 0.000 18
19 0.000 0.000 0.000 0.000 1.725& 20.05 & 454.4 " 106.6 " 22.61 & 388.2 " 1.098& 0.000 19
20 0.000 0.000 0.000 0.000 1.104& 23.68 & 324.8 " 96.03 " 18.71 & 207.4 " 0.405& 0.000 20
21 0.000 0.000 0.000 0.000 0.872& 73.76 $ 237.3 " 96.55 " 34.10 & 181.8 " 0.083& 0.000 21
22 0.000 0.000 0.000 0.000 4.924& 198.5 " 189.9 " 99.50 " 68.47 $ 169.4 " 0.000& 0.000 22
23 0.000 0.000 0.000 0.000 8.331& 354.9 " 159.6 " 102.1 " 40.47 $ 170.5 " 0.000 0.000 23
24 0.000 0.000 0.000 0.000 17.50 & 429.8 " 141.4 " 105.5 " 35.90 $ 132.3 " 0.000 0.000 24
25 0.000 0.000 0.000 0.000 40.39 $ 510.4 " 132.6 " 152.0 " 29.83 & 104.6 " 0.000 0.000 25
26 0.000 0.000 0.000 0.000 25.09 & 347.1 " 171.6 " 155.1 " 25.39 & 85.52 # 0.000 0.000 26
27 0.000 0.000 0.000 0.000 18.39 & 354.7 " 276.6 " 167.1 " 22.63 & 70.43 # 0.000 0.000 27
28 0.000 0.000 0.000 0.000 24.09 & 291.4 " 390.2 " 147.5 " 18.18 & 56.22 $ 0.000 0.000 28
29 0.000 0.000 0.000 0.000 16.27 & 224.4 " 552.3 " 137.4 " 15.64 & 42.88 $ 0.000 0.000 29
30 0.000 0.000 0.000 15.33 & 286.9 " 471.0 " 192.6 " 14.94 & 34.07 $ 0.000 0.000 30
31 0.000 0.000 16.80 & 339.0 " 168.3 " 26.29 & 0.000 31
Mean 0.000 0.000 0.000 0.000 12.80 & 117.5 & 280.3 " 164.2 " 46.34 & 77.32 & 9.837& 0.000
Median 0.000 0.000 0.000 0.000 8.331& 26.44 & 277.0 " 164.1 " 36.02 & 26.29 & 3.561& 0.000
Maximum 0.000 0.000 0.000 0.000 40.39 & 510.4 & 552.3 " 293.8 " 127.5 & 388.2 & 59.70 & 0.000
Minimum 0.000 0.000 0.000 0.000 0.000& 13.27 & 105.4 " 96.03 " 14.94 & 4.219& 0.000& 0.000
Total 0.000 0.000 0.000 0.000 396.7 &3524 &8688 "5089 "1390 &2397 & 295.1 & 0.000
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 59.51 & " ... Relative Uncertainty +/-10%
Ann. Median 4.979& # ... Relative Uncertainty +/-15%
Annual Total 21779 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 552.3 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1981
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.00 0.00 0.00 0.00 0.00 5948 " 1032 " 5317 " 706.4 " 124.4 " 17.56& 9.36& 1
2 0.00 0.00 0.15& 0.00 0.00 2728 " 923.1 " 3300 " 664.1 " 156.8 " 15.39& 9.19& 2
3 0.00 0.00 4.35& 0.00 0.00 1993 " 729.3 " 3016 " 607.5 " 165.6 " 13.50& 8.89& 3
4 0.00 0.00 5.95& 0.00 0.00 1178 " 617.9 " 2769 " 568.9 " 157.4 " 13.04& 8.24& 4
5 0.00 0.00 5.06& 0.00 0.00 855.7 " 559.6 " 2636 " 574.1 " 137.4 " 12.70& 6.91& 5
6 0.00 0.00 3.35& 0.00 0.00 1701 " 517.4 " 2043 " 541.3 " 117.1 " 21.19& 5.24& 6
7 0.00 0.00 0.70& 0.00 0.00 7670 " 498.5 " 2295 " 502.2 " 97.88" 15.41& 4.42& 7
8 0.00 0.00 0.44& 0.00 0.00 14310 " 599.0 " 2657 " 543.5 " 82.88# 16.32& 5.19& 8
9 0.00 0.00 0.16& 0.00 0.00 11490 " 568.3 " 2945 " 597.3 " 76.01# 16.78& 4.43& 9
10 0.00 0.00 0.03& 0.00 0.00 7826 " 572.1 " 5592 ! 684.2 " 71.31# 13.90& 4.15& 10
11 0.00 0.00 0.00& 0.00 0.00 4441 " 515.1 " 8266 ! 751.6 " 65.64# 12.80& 1.78& 11
12 0.00 0.00 0.00 0.00 0.00 3937 " 472.2 " 7867 " 565.2 " 53.60$ 473.2 & 0.57& 12
13 0.00 0.00 0.00 0.00 0.00 2777 " 433.6 " 5122 " 456.5 " 50.73$ 1402 " 0.20& 13
14 0.00 0.00 0.00 0.00 0.00 1944 " 409.9 " 3454 " 410.3 " 48.41$ 489.1 " 0.08& 14
15 0.00 0.00 0.00 0.00 0.00 1454 " 399.8 " 4002 " 376.3 " 43.58$ 229.0 " 0.01& 15
16 0.00 0.00 0.00 0.00 0.00 1330 " 383.7 " 5123 " 334.7 " 41.71$ 125.1 " 0.00 16
17 0.00 0.00 0.00 0.00 0.00 1162 " 532.2 " 4332 " 307.9 " 35.54& 86.23# 0.00 17
18 0.00 0.00 0.00 0.00 0.00 992.3 " 1029 " 2840 " 301.7 " 35.38$ 59.88$ 0.00 18
19 0.00 0.00 0.00 0.00 0.00 857.4 " 1550 " 2682 " 287.5 " 29.04& 44.02$ 0.00 19
20 0.00 0.00 0.00 0.00 0.00 751.2 " 1135 " 2558 " 280.3 " 29.23& 33.49& 0.00 20
21 0.00 0.00 0.00 0.00 0.00 720.7 " 823.5 " 2624 " 287.9 " 28.60& 25.69& 0.00 21
22 0.00 0.00 0.00 0.00 0.00 670.7 " 2675 " 2168 " 271.3 " 27.05& 23.65& 0.00 22
23 0.00 0.00 0.00 0.00 0.00 699.0 " 6997 " 1785 " 263.1 " 28.35& 20.71& 0.00 23
24 0.00 0.00 0.00 0.00 0.00 874.1 " 8207 " 1584 " 255.6 " 26.73& 17.00& 0.00 24
25 0.00 0.00 0.00 0.00 0.00 1044 " 4051 " 1439 " 230.4 " 22.71& 16.07& 0.00 25
26 0.00 0.00 0.00 0.00 49.99& 897.0 " 2860 " 1279 " 202.1 " 22.15& 18.24& 0.00 26
27 0.00 0.00 0.00 0.00 270.6 " 1338 " 4028 " 1116 " 170.7 " 21.79& 14.00& 0.00 27
28 0.00 0.00 0.00 0.00 642.2 " 1850 " 3933 " 1012 " 148.1 " 24.12& 13.35& 0.00 28
29 0.00 0.00 0.00 569.1 " 1473 " 3039 " 941.7 " 128.4 " 21.90& 11.48& 0.00 29
30 0.00 0.00 0.00 3443 " 1232 " 4268 " 837.5 " 121.0 " 22.54& 10.05& 0.00 30
31 0.00 0.00 7240 " 5100 " 749.2 " 19.76& 0.00 31
Mean 0.000 0.000 0.651& 0.000 394.0 &2871 "1918 "3044 ! 404.7 " 60.82 & 109.4 & 2.215&
Median 0.000 0.000 0.000& 0.000 0.000&1396 " 823.5 "2657 ! 355.5 " 41.71 & 17.28 & 0.000&
Maximum 0.00 0.00 5.95& 0.00 7240 &14310 " 8207 " 8266 ! 751.6 " 165.6 & 1402 & 9.36&
Minimum 0.000 0.000 0.000& 0.000 0.000& 670.7 " 383.7 " 749.2 ! 121.0 " 19.76 & 10.05 & 0.000&
Total 0.00 0.00 20.19& 0.00 12215 &86144 "59461 "94353 !12140 " 1885 & 3281 & 68.66&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 738.5 ! ! ... Not reviewed / Quality not known
Ann. Median 13.50 ! " ... Relative Uncertainty +/-10%
Annual Total 269568 ! # ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
Maximum Minimum & ... Relative Uncertainty +/-30%
Daily 14310 ! 0.000!
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1982
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 102.1 " 0.000 0.000 0.000 19.30 & 109.6 " 210.3 " 316.1 " 156.7 " 11.10 & 132.1 " 1
2 0.000 82.54 # 0.000 0.000 0.000 16.61 & 99.92 " 365.6 " 269.5 " 138.6 " 10.55 & 86.16 # 2
3 0.000 64.87 # 0.000 0.000 0.000 14.13 & 89.47 # 410.8 " 232.4 " 138.4 " 10.34 & 54.71 $ 3
4 0.000 51.12 $ 0.000 0.000 0.000 13.23 & 83.37 # 355.8 " 194.8 " 138.3 " 9.123& 36.65 $ 4
5 0.000 39.99 $ 0.000 0.000 0.000 15.61 & 84.22 # 375.3 " 168.1 " 143.1 " 8.004& 26.95 & 5
6 0.000 31.24 & 0.000 0.000 0.000 14.15 & 98.29 # 298.2 " 142.1 " 157.6 " 6.547& 15.68 & 6
7 0.000 23.61 & 0.000 0.000 0.000 14.57 & 151.9 " 364.5 " 122.0 " 189.3 " 5.944& 12.22 & 7
8 0.000 16.88 & 0.000 0.000 0.000 56.64 $ 174.6 " 773.9 " 108.6 " 301.1 " 4.328& 11.13 & 8
9 0.000 13.63 & 0.000 0.000 0.000 120.9 # 176.8 "1158 " 93.19 " 217.4 " 3.421& 10.41 & 9
10 0.000 12.40 & 0.000 0.000 0.000 219.2 " 157.9 "1002 " 80.75 # 145.3 " 2.132& 7.906& 10
11 0.000 10.24 & 0.000 0.000 0.000 165.8 " 134.4 " 712.8 " 71.89 # 105.1 " 1.805& 5.905& 11
12 0.000 8.575& 0.000 0.000 0.000 170.5 " 115.3 " 543.8 " 66.84 # 81.95 # 2.011& 2.820& 12
13 0.000 5.074& 0.000 0.000 0.000 161.3 " 97.94 " 462.7 " 57.78 # 75.54 # 1.131& 2.208& 13
14 0.000 2.903& 0.000 0.000 0.000 240.9 " 88.38 # 402.3 " 57.58 # 63.60 # 0.568& 0.871& 14
15 0.000 1.193& 0.000 0.000 0.000 285.0 " 91.23 # 335.1 " 109.2 # 53.33 $ 227.5 & 0.091& 15
16 0.000 1.614& 0.000 0.000 0.000 300.5 " 189.7 " 281.6 " 315.1 " 46.79 $ 156.1 " 0.008& 16
17 0.000 1.021& 0.000 0.000 0.000 412.1 " 296.6 " 241.8 " 398.7 " 39.85 $ 82.16 # 0.000 17
18 0.000 0.750& 0.000 0.000 0.000 423.8 " 229.5 " 221.0 " 639.4 " 33.27 $ 49.88 $ 0.000 18
19 0.000 0.390& 0.000 0.000 0.000 442.9 " 192.9 " 326.8 " 499.8 " 30.04 & 32.22 & 0.000 19
20 0.000! 0.040& 0.000 0.000 0.000 368.9 " 243.1 " 422.8 " 340.2 " 25.73 & 20.11 & 0.000 20
21 0.031! 0.004& 0.000 0.000 0.000 301.8 " 451.3 " 507.0 " 277.7 " 22.36 & 15.01 & 0.000 21
22 475.0 ! 0.000 0.000 0.000 0.000 236.8 " 804.3 " 443.3 " 280.6 " 19.57 & 11.33 & 0.000 22
23 3568 ! 0.000 0.000 0.000 0.000 182.2 " 909.2 " 456.0 " 271.8 " 16.29 & 9.984& 0.000 23
24 1986 ! 0.000 0.000 0.000 0.000 151.5 " 768.8 " 861.1 " 330.4 " 14.72 & 8.615& 0.000 24
25 1046 ! 0.000 0.000 0.000 0.000 139.0 " 629.9 "1039 " 372.7 " 16.88 & 7.906& 0.000 25
26 640.4 " 0.000 0.000 0.000 0.000 152.8 " 480.7 "1130 " 366.3 " 15.44 & 25.02 & 0.000 26
27 465.4 " 0.000 0.000 0.000 18.77 & 148.2 " 387.4 " 819.4 " 344.0 " 14.92 & 17.78 & 0.000 27
28 356.7 " 0.000 0.000 0.000 69.87 # 134.2 " 349.0 " 702.2 " 305.5 " 12.92 & 133.9 & 0.000 28
29 250.2 " 0.000 0.000 44.62 $ 132.7 " 292.3 " 622.1 " 236.7 " 12.62 & 165.0 " 0.000 29
30 171.4 " 0.000 0.000 33.93 $ 124.1 " 262.1 " 481.4 " 185.0 " 11.95 & 203.5 " 0.000 30
31 126.2 " 0.000 24.91 & 229.0 " 387.4 " 11.46 & 0.000 31
Mean 293.1 ! 16.79 & 0.000 0.000 6.197& 172.6 & 273.2 # 539.1 " 241.8 # 79.04 & 41.43 & 13.09 &
Median 0.000! 2.259& 0.000 0.000 0.000& 152.1 & 189.7 # 443.3 " 253.1 # 46.79 & 10.44 & 0.008&
Maximum 3568 ! 102.1 & 0.000 0.000 69.87 & 442.9 & 909.2 #1158 " 639.4 # 301.1 & 227.5 & 132.1 &
Minimum 0.000! 0.000& 0.000 0.000 0.000& 13.23 & 83.37 # 210.3 " 57.58 # 11.46 & 0.568& 0.000&
Total 9085 ! 470.1 & 0.00 0.00 192.1 & 5179 & 8469 #16714 " 7255 # 2450 & 1243 & 405.8 &
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 141.0 ! ! ... Not reviewed / Quality not known
Ann. Median 15.44 ! " ... Relative Uncertainty +/-10%
Annual Total 51463 ! # ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
Maximum Minimum & ... Relative Uncertainty +/-30%
Daily 3568 ! 0.000!
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1983
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.00 0.00 0.00 3.56& 0.00 5.33!12155 " 8611 " 3468 " 467.8 " 22.95& 34.28$ 1
2 0.00 0.00 0.00 11.42& 0.00 127.9 ! 7677 " 7607 " 4080 " 438.5 " 20.56& 34.87$ 2
3 0.00 0.00 0.00 4.53& 0.00 402.7 ! 5167 " 6441 " 4583 " 409.2 " 20.20& 40.22$ 3
4 0.00 0.00 0.00 2.36& 0.00 793.4 ! 3685 " 5130 " 5283 " 372.7 " 14.91& 36.81$ 4
5 0.00 0.00 0.00 1.43& 0.00 1298 ! 3525 " 4326 "10256 " 344.8 " 14.59& 31.95$ 5
6 0.00 0.00 0.00 0.66& 0.00 593.3 ! 3104 " 4456 " 8156 " 323.7 " 46.53& 30.91$ 6
7 0.00 0.00 0.00 0.26& 0.00 280.1 ! 2589 " 5208 " 8194 " 303.7 " 81.80# 30.83& 7
8 0.00 0.00 0.00 0.07& 0.00 145.2 ! 7661 " 3627 " 8021 " 284.2 " 85.91# 26.38& 8
9 0.00 0.00 0.00 0.00& 0.00 104.3 "14582 " 2974 " 6008 " 245.7 " 69.45# 21.86& 9
10 0.00 0.00 0.00 0.00 0.00 79.98#13029 " 2561 " 4459 " 197.8 " 48.60$ 17.60& 10
11 0.00 0.00 0.00 0.00 0.00 74.55# 9630 " 2309 " 3566 " 173.9 " 34.18$ 12.13& 11
12 0.00 0.00 0.00 0.00 0.00 77.03# 7695 " 2369 " 3106 " 160.4 " 126.5 $ 10.58& 12
13 0.00 0.00 0.00 0.00 0.00 67.28# 5282 " 3193 " 3591 " 151.7 " 237.7 " 6.99& 13
14 0.00 0.00 0.00 0.00 0.00 61.42# 5166 " 4504 " 4027 " 141.0 " 281.7 " 3.69& 14
15 0.00 0.00 0.00 0.00 0.00 54.47$ 4711 " 2949 " 3217 " 127.7 " 193.7 " 3.88& 15
16 0.00 0.00 0.00 0.00 0.00 45.39$ 3825 " 2582 " 2701 " 116.8 " 215.9 " 3.31& 16
17 0.00 0.00 0.00 0.00 0.00 129.1 $ 3040 " 2120 " 3061 " 108.9 " 399.3 " 1.78& 17
18 0.00 0.00 7.88& 0.00 0.00 1137 " 2490 " 1909 " 2493 " 100.1 " 639.5 " 0.96& 18
19 0.00 0.00 13.45& 0.00 0.00 1319 " 2110 " 1697 " 1986 " 91.38" 622.5 " 0.49& 19
20 0.00 0.00 7.64& 0.00 0.00 1933 " 1840 " 1659 " 1676 " 79.77# 421.8 " 0.12& 20
21 0.00 0.00 3.40& 0.00 0.00 1139 " 1680 " 1537 " 1402 " 65.36# 291.9 " 0.03& 21
22 0.00 0.00 0.97& 0.00 0.00 882.5 " 1508 " 1357 " 1219 " 59.18# 204.2 " 0.00& 22
23 0.00 0.00 0.18& 0.00 0.00 798.4 " 1350 " 1412 " 1043 " 51.69$ 143.4 " 0.00& 23
24 0.00 0.00 0.01& 0.00 0.00 633.9 " 2678 " 2321 " 878.1 " 46.33$ 110.3 " 0.00 24
25 0.00 0.00 0.00 0.00 0.00 596.5 "10477 " 5201 " 816.7 " 43.40$ 94.89" 0.00 25
26 0.00 0.00 0.00 0.00 0.00 618.8 "28321 " 6962 " 834.7 " 37.83$ 81.68# 0.00 26
27 0.00 0.00 0.00 0.00 0.00 587.3 "22973 " 5032 " 760.4 " 36.26$ 66.64# 0.00 27
28 0.00 0.00 0.00 0.00 0.00 4207 "13879 " 2958 " 651.6 " 35.06$ 52.47$ 0.00 28
29 0.00 0.00 0.00 0.00 14434 " 9736 " 2833 " 563.3 " 32.83$ 42.02$ 0.00 29
30 0.00 0.00 0.00 0.00 22028 " 8137 " 3173 " 507.9 " 31.02$ 36.06$ 49.30& 30
31 0.00 0.00 0.00! 9456 " 3154 " 28.44& 66.05$ 31
Mean 0.000 0.000 1.082& 0.810& 0.000!1822 !7392 "3618 "3354 " 164.7 & 157.4 & 15.00 &
Median 0.000 0.000 0.000& 0.000& 0.000! 590.3 !5167 "2974 "3083 " 116.8 & 83.85 & 3.880&
Maximum 0.00 0.00 13.45& 11.42& 0.00!22028 !28321 " 8611 "10256 " 467.8 & 639.5 & 66.05&
Minimum 0.000 0.000 0.000& 0.000& 0.000! 5.328!1350 "1357 " 507.9 " 28.44 & 14.59 & 0.000&
Total 0.0 0.0 33.5& 24.3& 0.0! 54654 !229156 "112173 "100607 " 5107 & 4722 & 465.0&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 1389 ! ! ... Not reviewed / Quality not known
Ann. Median 31.02 ! " ... Relative Uncertainty +/-10%
Annual Total 506943 ! # ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
Maximum Minimum & ... Relative Uncertainty +/-30%
Daily 28321 ! 0.000!
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1984
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 46.02 & 0.000 0.000 0.000 84.71 # 980.4 " 338.0 " 406.3 " 333.9 " 177.2 " 19.13 & 0.798& 1
2 14.84 & 0.000 0.000 0.000 73.48 # 742.6 " 309.6 " 481.1 " 332.6 " 183.6 " 17.68 & 0.232& 2
3 96.87 & 0.000 0.000 0.000 74.71 # 603.1 " 352.8 " 604.6 " 337.1 " 182.3 " 16.63 & 0.025& 3
4 190.4 " 0.000 0.000 0.000 83.66 # 509.5 " 629.5 "1357 " 314.2 " 186.9 " 15.21 & 0.004& 4
5 102.4 # 0.000 0.000 0.000 83.04 # 442.7 "1172 "1055 " 344.8 " 189.7 " 17.89 & 0.000 5
6 61.55 $ 0.000 0.000 0.000 93.85 # 470.0 "1746 "1060 " 384.8 " 163.9 " 18.50 & 0.000 6
7 43.82 $ 0.000 0.000 0.000 171.3 " 561.9 "1701 "1281 " 364.7 " 157.1 " 20.45 & 0.000 7
8 33.23 $ 0.000 0.000 0.000 254.4 " 720.6 "1382 "1024 " 403.1 " 146.7 " 30.43 & 0.000 8
9 28.12 & 0.000 0.000 0.000 293.5 " 602.0 "1059 " 984.8 " 418.5 " 136.2 " 41.15 & 0.000 9
10 23.56 & 0.000 0.000 0.000 391.1 " 457.7 " 903.7 " 915.8 " 401.2 " 132.3 " 40.54 $ 0.000 10
11 16.54 & 0.000 0.000 0.000 390.0 " 379.9 " 733.8 " 798.9 " 548.8 " 144.8 " 40.80 $ 0.000 11
12 15.04 & 0.000 0.000 0.000 362.6 " 333.9 " 602.4 " 704.1 " 557.9 " 133.7 " 87.01 # 0.000 12
13 15.48 & 0.000 0.000 0.000 297.2 " 326.8 " 530.8 " 674.3 " 414.6 " 118.8 " 103.3 " 0.000 13
14 10.25 & 0.000 0.000 0.000 234.1 " 360.2 " 474.3 " 672.3 " 582.6 " 102.7 " 75.04 # 0.000 14
15 5.938& 0.000 0.000 0.000 190.9 " 755.3 " 438.5 " 673.7 "2017 " 89.44 # 51.77 $ 0.000 15
16 5.176& 0.000 0.000 0.000 164.7 " 835.8 " 462.9 " 780.5 "6717 " 79.38 # 42.91 $ 0.000 16
17 6.309& 0.000 0.000 0.000 161.3 " 554.5 " 508.2 " 905.1 "2930 " 73.17 # 34.55 $ 0.000 17
18 5.065& 0.000 0.000 0.000 221.0 " 435.7 " 596.8 " 886.8 "1895 " 65.53 # 27.59 & 0.000 18
19 2.380& 0.000 0.000 0.000 347.4 " 368.0 " 627.4 " 735.8 "1396 " 57.58 # 21.04 & 0.000 19
20 0.710& 0.000 0.000 0.000 910.2 " 322.0 " 577.4 " 688.3 " 947.7 " 51.85 $ 14.46 & 0.000 20
21 0.124& 0.000 0.000 0.000 1223 " 322.0 " 554.9 " 699.6 " 729.4 " 48.20 $ 10.81 & 0.000 21
22 0.003& 0.000 0.000 0.000 1448 " 390.2 " 548.6 " 670.2 " 611.9 " 42.35 $ 8.159& 0.000 22
23 0.000 0.000 0.000 0.000 1085 "1027 " 524.9 " 676.3 " 517.3 " 39.21 $ 8.667& 0.000 23
24 0.000 0.000 0.000 18.26 & 827.4 "1170 " 475.9 " 719.9 " 432.9 " 36.31 $ 6.168& 0.000 24
25 0.000 0.000 0.000 57.66 $ 668.5 " 741.2 " 440.5 " 609.7 " 365.8 " 33.35 $ 4.403& 0.000 25
26 0.000 0.000 0.000 98.85 # 873.9 " 572.2 " 429.6 " 511.3 " 307.9 " 29.66 & 2.952& 0.000 26
27 0.000 0.000 0.000 69.52 #1652 " 511.0 " 461.8 " 441.3 " 266.1 " 28.50 & 2.167& 0.000 27
28 0.000 0.000 0.000 51.35 $2455 " 492.7 " 493.3 " 381.5 " 244.9 " 24.79 & 2.771& 0.000 28
29 0.000 0.000 0.000 63.08 $2626 " 431.3 " 547.6 " 354.9 " 215.6 " 20.94 & 2.152& 0.000 29
30 0.000 0.000 90.84 #2118 " 374.5 " 502.3 " 346.9 " 187.3 " 17.36 & 1.368& 0.000 30
31 0.000 0.000 1406 " 442.3 " 341.4 " 17.85 & 0.000 31
Mean 23.35 & 0.000 0.000 14.99 & 686.0 # 559.8 " 663.5 " 723.9 " 850.7 " 93.92 & 26.19 & 0.034&
Median 5.938& 0.000 0.000 0.000& 347.4 # 501.1 " 530.8 " 688.3 " 408.8 " 79.38 & 18.20 & 0.000&
Maximum 190.4 & 0.000 0.000 98.85 &2626 #1170 "1746 "1357 "6717 " 189.7 & 103.3 & 0.798&
Minimum 0.000& 0.000 0.000 0.000& 73.48 # 322.0 " 309.6 " 341.4 " 187.3 " 17.36 & 1.368& 0.000&
Total 723.8 & 0.00 0.00 449.6 &21266 #16795 "20567 "22442 "25520 " 2911 & 785.6 & 1.06&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 304.5 & " ... Relative Uncertainty +/-10%
Ann. Median 57.62 & # ... Relative Uncertainty +/-15%
Annual Total 111462 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 6717 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1985
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 0.000 79.71 # 550.5 " 504.4 " 100.5 " 6.346& 2.938& 1
2 0.000 0.000 0.000 0.000 0.000 0.000 174.5 " 522.5 " 444.0 " 85.65 # 6.145& 2.760& 2
3 0.000 0.000 0.000 0.000 0.000 0.000 406.7 " 513.9 " 425.9 " 78.36 # 9.211& 1.836& 3
4 0.000 0.000 0.000 0.000 0.000 0.000 574.4 " 686.5 " 347.3 " 73.32 # 7.169& 0.580& 4
5 0.000 0.000 0.000 0.000 0.000 0.000 401.6 " 980.5 " 286.5 " 66.27 # 7.086& 0.121& 5
6 0.000 0.000 0.000 0.000 0.000 0.000 301.8 "1039 " 244.0 " 57.54 # 6.266& 0.000 6
7 0.000 0.000 0.000 0.000 0.000 0.000 223.2 " 767.6 " 211.1 " 50.10 $ 6.451& 0.000 7
8 0.000 0.000 0.000 0.000 0.000 11.40 & 169.0 " 610.4 " 183.5 " 47.36 $ 4.740& 0.000 8
9 0.000 0.000 0.000 0.000 0.000 25.30 & 134.3 " 512.4 " 168.5 " 39.15 $ 3.371& 0.000 9
10 0.000 0.000 0.000 0.000 0.000 29.19 & 113.4 " 504.4 " 156.6 " 39.23 $ 3.111& 0.000 10
11 0.000 0.000 0.000 0.000 0.000 34.47 $ 96.29 " 567.9 " 148.7 " 35.45 $ 2.793& 0.000 11
12 0.000 0.000 0.000 0.000 0.000 36.40 $ 86.41 # 643.4 " 143.5 " 34.06 & 1.224& 0.000 12
13 0.000 0.000 0.000 0.000 0.000 40.70 $ 108.3 # 495.7 " 144.8 " 33.51 & 0.252& 0.000 13
14 0.000 0.000 0.000 0.000 0.000 41.75 $ 201.1 " 405.4 " 135.3 " 28.91 & 0.048& 0.000 14
15 0.000 0.000 0.000 0.000 0.000 38.08 $ 312.5 " 344.8 " 125.7 " 28.71 & 0.005& 0.000 15
16 0.000 0.000 0.000 0.000 0.000 34.64 $ 589.0 " 300.9 " 114.6 " 24.19 & 0.000& 0.000 16
17 0.000 0.000 0.000 0.000 0.000 27.95 & 519.2 " 264.4 " 114.5 " 22.43 & 0.000 0.000 17
18 0.000 0.000 0.000 0.000 0.000 26.94 & 400.6 " 252.5 " 189.5 " 20.46 & 0.000 0.000 18
19 0.000 0.000 0.000 0.000 0.000 23.69 & 439.7 " 448.5 " 184.5 " 28.42 & 0.000 0.000 19
20 0.000 0.000 0.000 0.000 0.000 23.13 & 549.2 " 598.8 " 199.7 " 21.59 & 0.000 0.000 20
21 0.000 0.000 0.000 0.000 0.000 24.54 & 650.6 "1178 " 268.3 " 18.96 & 0.000 0.000 21
22 0.000 0.000 0.000 0.000 0.000 26.31 & 573.3 "1031 " 302.9 " 17.53 & 0.000 0.000 22
23 0.000 0.000 0.000 0.000 0.000 27.26 & 418.3 " 677.0 " 332.6 " 15.09 & 0.433& 0.000 23
24 0.000 0.000 0.000 0.000 0.000 31.51 $ 295.5 " 571.1 " 296.6 " 13.31 & 20.81 & 0.000 24
25 0.000 0.000 0.000 0.000 0.000 34.92 $ 261.9 " 598.8 " 247.3 " 11.29 & 15.36 & 0.000 25
26 0.000 0.000 0.000 0.000 0.000 34.51 $ 311.0 " 764.8 " 208.6 " 10.13 & 16.89 & 0.000 26
27 0.000 0.000 0.000 0.000 0.000 30.61 & 456.0 "1049 " 167.4 " 9.856& 15.07 & 0.000 27
28 0.000 0.000 0.000 0.000 0.000 29.47 $ 860.8 "1345 " 139.5 " 7.583& 10.23 & 0.000 28
29 0.000 0.000 0.000 0.000 42.77 $1429 "1392 " 125.9 " 6.901& 6.214& 0.000 29
30 0.000 0.000 0.000 0.000 54.64 #1193 " 857.0 " 115.8 " 9.074& 3.891& 0.000 30
31 0.000 0.000 0.000 718.4 " 603.5 " 9.055& 0.000 31
Mean 0.000 0.000 0.000 0.000 0.000 24.34 & 420.9 # 679.9 " 222.6 " 33.68 & 5.104& 0.266&
Median 0.000 0.000 0.000 0.000 0.000 27.61 & 400.6 # 598.8 " 187.0 " 28.42 & 3.631& 0.000&
Maximum 0.000 0.000 0.000 0.000 0.000 54.64 &1429 #1392 " 504.4 " 100.5 & 20.81 & 2.938&
Minimum 0.000 0.000 0.000 0.000 0.000 0.000& 79.71 # 252.5 " 114.5 " 6.901& 0.000& 0.000&
Total 0.00 0.00 0.00 0.00 0.00 730.2 &13049 #21077 " 6677 " 1044 & 153.1 & 8.24&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 117.1 & " ... Relative Uncertainty +/-10%
Ann. Median 0.000& # ... Relative Uncertainty +/-15%
Annual Total 42739 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 1429 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1986
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 192.4 " 1.570& 0.000 62.69 #2763 "5346 " 656.0 " 99.54 " 16.70 & 0.797& 1
2 0.000 0.000 133.7 " 1.139& 0.000 53.29 $1866 "7520 " 615.2 " 92.80 " 13.15 & 0.464& 2
3 0.000 0.000 88.06 # 0.924& 0.000 46.65 $1632 "4435 " 597.2 " 87.44 " 11.53 & 0.119& 3
4 0.000 0.000 64.11 # 0.392& 0.000 41.03 $1611 "2563 " 568.6 " 85.32 # 9.908& 0.005& 4
5 0.000 0.000 47.34 $ 0.207& 0.000 38.08 $1385 "1945 " 533.6 " 83.24 # 8.394& 0.000 5
6 0.000 0.000 32.24 & 0.079& 0.000 36.68 $1057 "1434 " 484.2 " 79.42 # 8.282& 0.000 6
7 0.000 0.000 23.66 & 0.033& 0.000 32.84 $ 937.6 "1189 " 431.5 " 75.83 # 8.620& 0.000 7
8 0.000 0.000 18.27 & 0.003& 0.000 30.80 $ 821.1 "1422 " 407.0 " 70.22 # 9.613& 0.000 8
9 0.000 0.000 15.20 & 0.000& 0.000 37.81 $ 705.8 "1779 " 404.5 " 67.47 # 9.178& 0.000 9
10 0.000 0.000 15.49 & 0.000 0.000 40.56 $ 614.8 "1699 " 407.0 " 65.84 # 13.86 & 0.000 10
11 0.000 0.000 13.33 & 0.000 0.000 44.06 $ 549.5 "1422 " 396.3 " 62.32 # 36.00 & 0.000 11
12 0.000 0.000 13.48 & 0.000 0.000 50.38 $ 501.2 "1333 " 385.1 " 75.59 # 41.53 $ 0.000 12
13 0.000 0.000 10.41 & 0.000 0.000 54.35 $ 483.8 "1283 " 359.1 " 161.8 # 47.42 $ 0.000 13
14 0.000 0.000 9.685& 0.000 2.349! 64.79 # 827.3 "1129 " 338.7 " 188.6 " 51.83 $ 0.000 14
15 0.000 0.000 16.64 & 0.000 39.29 ! 70.99 #2425 "1207 " 435.7 " 170.8 " 39.24 $ 0.000 15
16 0.000 0.000 14.20 & 0.000 100.9 ! 172.9 #3333 "1028 " 560.6 " 135.5 " 33.64 & 0.000 16
17 0.000 0.000 10.34 & 0.000 88.95 ! 411.9 "1978 " 979.7 " 551.1 " 112.4 " 31.96 $ 0.000 17
18 0.000 0.000 10.41 & 0.000 40.04 ! 733.9 "1211 "1062 " 506.4 " 108.5 " 29.31 & 0.000 18
19 0.000 0.000 11.45 & 0.000 53.88 $1179 " 962.7 "1102 " 428.2 " 97.04 " 24.30 & 0.000 19
20 0.000 0.000 6.175& 0.000 56.59 $ 733.7 " 861.2 "1452 " 361.2 " 86.47 # 21.42 & 0.000 20
21 0.000 0.000 18.56 & 0.000 66.15 # 443.3 " 849.0 "1543 " 330.6 " 71.74 # 15.09 & 0.000 21
22 0.000 360.8 ! 13.73 & 0.000 137.2 " 309.6 " 881.5 "1953 " 304.0 " 61.76 # 12.86 & 0.000 22
23 0.000 893.1 ! 10.96 & 0.000 238.8 " 249.6 " 932.6 "1776 " 275.2 " 54.48 $ 12.31 & 0.000 23
24 0.000 945.3 " 10.13 & 0.000 302.1 " 222.6 " 944.6 "1867 " 239.6 " 47.58 $ 11.12 & 0.000 24
25 0.000 776.2 " 9.027& 0.000 276.1 " 703.7 " 860.7 "1554 " 200.5 " 38.38 $ 7.052& 0.000 25
26 0.000 442.8 " 7.770& 0.000 192.3 "2368 " 770.8 "1367 " 181.8 " 35.23 & 3.141& 0.000 26
27 0.000 332.6 " 7.307& 0.000 142.6 "5869 " 642.8 "1148 " 147.7 " 25.03 & 2.937& 0.000 27
28 0.000 264.7 " 6.459& 0.000 126.4 "5824 " 571.9 " 988.5 " 127.4 " 26.82 & 3.449& 0.000 28
29 0.000 3.836& 0.000 106.9 "6820 " 539.1 " 895.2 " 117.0 " 19.34 & 2.997& 0.000 29
30 0.000 2.496& 0.000 90.76 "6155 " 594.1 " 828.1 " 105.4 " 19.04 & 1.590& 0.000 30
31 0.000 2.806& 76.69 # 1763 " 735.4 " 18.48 & 0.000 31
Mean 0.000 143.4 ! 27.08 & 0.145& 68.97 !1097 $1157 "1806 " 381.9 " 78.20 & 17.95 & 0.045&
Median 0.000 0.000! 13.33 & 0.000& 40.04 ! 121.9 $ 881.5 "1422 " 400.4 " 75.59 & 12.59 & 0.000&
Maximum 0.000 945.3 ! 192.4 & 1.570& 302.1 !6820 $3333 "7520 " 656.0 " 188.6 & 51.83 & 0.797&
Minimum 0.000 0.000! 2.496& 0.000& 0.000! 30.80 $ 483.8 " 735.4 " 105.4 " 18.48 & 1.590& 0.000&
Total 0.00 4015 ! 839.6 & 4.35& 2138 !32903 $35876 "55985 "11457 " 2424 & 538.4 & 1.39&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 400.5 ! ! ... Not reviewed / Quality not known
Ann. Median 32.24 ! " ... Relative Uncertainty +/-10%
Annual Total 146182 ! # ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
Maximum Minimum & ... Relative Uncertainty +/-30%
Daily 7520 ! 0.000!
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1987
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 25.15 & 149.0 "2744 " 433.3 " 154.2 " 5.961& 0.509& 1
2 0.000 0.000 0.000 0.000 0.000 23.36 & 138.0 "2152 " 425.6 " 116.4 " 6.541& 0.317& 2
3 0.000 0.000 0.000 0.000 0.000 24.23 & 151.8 "1503 " 383.9 " 95.07 " 6.641& 0.104& 3
4 0.000 0.000 0.000 0.000 0.000 24.85 & 239.6 "1050 " 348.5 " 80.99 # 5.979& 0.010& 4
5 0.000 0.000 0.000 0.000 0.000 25.29 & 224.1 " 806.5 " 312.8 " 69.44 # 5.453& 0.000& 5
6 0.000 0.000 0.000 0.000 0.000 44.25 & 311.5 " 664.0 " 277.3 " 63.90 # 5.702& 0.000 6
7 0.000 0.000 0.000 0.000 0.000 96.77 $ 399.6 " 570.6 " 246.0 " 59.30 # 5.976& 0.000 7
8 0.000 0.000 0.000 0.000 0.000 166.9 " 403.9 " 495.3 " 217.1 " 55.22 $ 4.960& 0.000 8
9 0.000 0.000 0.000 0.000 358.7 & 157.3 " 427.7 " 436.8 " 198.0 " 52.71 $ 3.510& 0.000 9
10 0.000 0.000 0.000 0.000 710.0 " 183.5 " 492.2 " 384.4 " 180.6 " 47.13 $ 4.616& 0.000 10
11 0.000 0.000 0.000 0.000 446.2 " 180.4 " 507.3 " 341.8 " 163.8 " 42.56 $ 4.058& 0.000 11
12 0.000 0.000 0.000 0.000 411.7 " 152.2 " 347.7 " 325.0 " 148.9 " 40.63 $ 2.905& 0.000 12
13 0.000 0.000 0.000 0.000 241.7 " 143.8 " 268.1 " 405.1 " 137.4 " 40.15 $ 1.429& 0.000 13
14 0.000 0.000 0.000 0.000 164.3 " 120.1 " 223.5 " 392.5 " 127.4 " 39.57 $ 1.839& 0.000 14
15 0.000 0.000 0.000 0.000 114.1 " 114.2 " 194.6 " 445.1 " 115.0 " 39.74 $ 5.171& 0.000 15
16 0.000 0.000 0.000 0.000 88.69 # 118.7 " 181.9 " 459.3 " 102.8 " 31.56 & 2.772& 0.000 16
17 0.000 0.000 0.000 0.000 73.13 # 141.6 " 175.6 " 352.4 " 91.19 # 26.20 & 3.232& 0.000 17
18 0.000 0.000 0.000 0.000 63.98 # 175.5 " 164.6 " 297.2 " 84.70 # 25.43 & 1.913& 0.000 18
19 0.000 0.000 0.000 0.000 53.00 $ 319.5 " 149.1 " 268.2 " 96.01 " 27.47 & 0.471& 0.000 19
20 0.000 0.000 0.000 0.000 47.15 $ 420.8 " 138.7 " 312.6 " 125.9 " 22.53 & 0.242& 0.000 20
21 0.000 0.000 0.000 0.000 45.04 $ 371.0 " 124.9 " 790.2 " 125.2 " 17.39 & 0.080& 0.000 21
22 0.000 0.000 0.000 0.000 42.98 $ 345.3 " 114.2 " 801.0 " 103.7 " 15.58 & 0.031& 0.000 22
23 0.000 0.000 0.000 0.000 38.06 $ 322.7 " 117.8 " 824.7 " 101.5 " 13.89 & 0.364& 0.000 23
24 0.000 0.000 0.000 0.000 37.83 $ 253.6 " 122.0 " 583.0 " 116.7 " 12.64 & 1.264& 0.000 24
25 0.000 0.000 0.000 0.000 34.43 $ 201.4 " 163.3 " 704.5 " 133.2 " 11.26 & 1.947& 0.000 25
26 0.000 0.000 0.000 0.000 37.30 $ 183.4 " 148.8 "1270 " 150.1 " 8.849& 1.492& 0.000 26
27 0.000 0.000 0.000 0.000 38.73 $ 177.6 " 144.8 "1723 " 199.3 " 8.625& 1.255& 0.733& 27
28 0.000 0.000 0.000 0.000 35.91 $ 166.0 " 173.8 "1329 " 207.5 " 8.224& 0.379& 16.36 & 28
29 0.000 0.000 0.000 34.18 $ 157.7 " 736.4 " 766.1 " 190.4 " 7.273& 0.619& 10.36 & 29
30 0.000 0.000 0.000 31.28 $ 162.6 "2081 " 561.0 " 185.5 " 6.034& 1.222& 5.294& 30
31 0.000 0.000 29.03 & 5777 " 465.5 " 7.599& 1.857& 31
Mean 0.000 0.000 0.000 0.000 102.5 & 166.7 & 483.6 " 781.4 " 191.0 # 40.24 & 2.934& 1.147&
Median 0.000 0.000 0.000 0.000 38.06 & 160.1 & 181.9 " 570.6 " 157.0 # 31.56 & 2.359& 0.000&
Maximum 0.000 0.000 0.000 0.000 710.0 & 420.8 &5777 "2744 " 433.3 # 154.2 & 6.641& 16.36 &
Minimum 0.000 0.000 0.000 0.000 0.000& 23.36 & 114.2 " 268.2 " 84.70 # 6.034& 0.031& 0.000&
Total 0.00 0.00 0.00 0.00 3177 & 5000 &14993 "24224 " 5729 # 1248 & 88.02& 35.55&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 149.3 & " ... Relative Uncertainty +/-10%
Ann. Median 5.961& # ... Relative Uncertainty +/-15%
Annual Total 54494 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 5777 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1988
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.541& 0.000 0.000 0.000 0.000 68.04 # 557.7 " 928.3 " 791.0 " 911.5 ! 27.17 & 0.000 1
2 0.124& 0.000 0.000 0.000 0.000 204.6 # 477.6 " 809.7 " 590.7 "1201 ! 25.22 & 0.000 2
3 0.005& 0.000 0.000 0.000 0.000 788.0 ! 414.4 " 729.5 " 472.6 " 643.9 " 25.75 & 0.000 3
4 0.000 0.000 0.000 0.000 8.084&1512 ! 367.1 " 647.5 " 405.6 " 544.9 " 22.66 & 0.000 4
5 0.000 0.000 0.000 0.000 63.15 #1028 ! 358.7 " 575.4 " 364.5 " 489.0 " 19.03 & 53.73 & 5
6 0.000 0.000 0.000 0.000 62.64 # 683.3 " 354.7 " 512.0 " 363.3 " 596.8 " 17.56 & 302.2 $ 6
7 0.000 0.000 0.000 0.000 54.49 $ 571.3 " 394.0 " 460.3 " 422.6 " 520.9 " 16.81 & 425.0 " 7
8 0.000 0.000 0.000 0.000 39.01 & 511.0 " 567.1 " 422.0 " 561.0 " 393.0 " 19.01 & 305.2 " 8
9 0.000 0.000 0.000 0.000 27.24 & 457.7 " 706.8 " 393.1 " 769.9 " 337.2 " 19.46 & 201.8 " 9
10 0.000 0.000 0.000 0.000 24.40 & 391.6 " 839.1 " 403.0 " 672.0 " 340.5 " 14.64 & 130.8 " 10
11 0.000 0.000 0.000 0.000 17.93 & 343.6 " 624.5 " 439.7 " 534.0 " 276.0 " 11.15 & 85.99 # 11
12 0.000 0.000 0.000 0.000 19.84 & 309.3 " 497.9 " 953.8 " 442.7 " 227.6 " 10.14 & 55.65 $ 12
13 0.000 0.000 0.000 0.000 23.07 & 369.8 " 604.8 "1960 " 362.1 " 188.0 " 11.53 & 38.49 & 13
14 0.000 0.000 0.000 0.000 35.82 $ 432.3 " 961.3 "2752 " 312.0 " 165.3 " 11.12 & 25.38 & 14
15 0.000 0.000 0.000 0.000 57.94 $ 925.8 "1946 "2228 " 283.2 " 140.2 " 10.07 & 17.64 & 15
16 0.000 0.000 0.000 0.000 108.4 #1128 "1156 "3494 " 259.1 " 128.8 " 8.425& 12.71 & 16
17 0.000 0.000 0.000 0.000 145.3 " 851.2 "1017 "4163 " 231.5 " 112.5 " 5.277& 12.42 & 17
18 0.000 0.000 0.000 0.000 118.0 " 756.2 " 958.5 "2485 " 208.4 " 104.8 " 1.401& 9.976& 18
19 0.000 0.000 0.000 0.000 83.91 # 905.1 " 818.9 "1701 " 181.9 " 108.1 " 1.174& 7.987& 19
20 0.000 0.000 0.000 0.000 74.54 # 815.8 " 890.2 "1355 " 173.3 " 104.0 " 1.569& 5.280& 20
21 0.000 0.000 0.000 0.000 89.75 # 596.1 " 687.2 "1114 " 164.9 " 112.3 " 1.461& 3.981& 21
22 0.000 0.000 0.000 0.000 131.6 " 478.7 " 547.9 " 937.3 " 185.6 " 99.70 # 1.767& 2.471& 22
23 0.000 0.000 0.000 0.000 170.1 " 394.8 " 555.0 " 780.7 " 234.8 " 83.46 # 1.837& 1.486& 23
24 0.000 0.000 0.000 0.000 148.9 " 331.3 "1915 " 658.0 " 214.0 " 76.99 # 1.321& 0.646& 24
25 0.000 0.000 0.000 0.000 133.2 " 335.8 "7897 " 631.8 " 280.3 " 67.43 # 0.382& 0.074& 25
26 0.000 0.000 0.000 0.000 103.7 " 543.8 "6933 " 702.9 " 282.9 " 59.25 # 0.094& 0.000& 26
27 0.000 0.000 0.000 0.000 88.73 #1377 "3213 " 790.9 " 224.9 " 51.05 $ 0.022& 0.000 27
28 0.000 0.000 0.000 0.000 79.88 #1703 "2146 " 775.6 " 191.7 " 44.98 $ 0.002& 0.000 28
29 0.000 0.000 0.000 0.000 71.97 #1013 "1665 " 629.4 " 210.2 " 38.56 $ 0.000 0.000 29
30 0.000 0.000 0.000 66.53 # 702.0 "1334 " 698.2 " 406.2 " 35.04 $ 0.000 0.000 30
31 0.000 0.000 61.77 # 1099 " 695.2 " 30.30 & 0.000 31
Mean 0.022& 0.000 0.000 0.000 68.06 & 684.2 !1371 "1156 " 359.9 " 265.6 ! 9.536& 54.80 &
Median 0.000& 0.000 0.000 0.000 63.15 & 583.7 ! 818.9 " 775.6 " 297.6 " 128.8 ! 9.248& 5.280&
Maximum 0.541& 0.000 0.000 0.000 170.1 &1703 !7897 "4163 " 791.0 "1201 ! 27.17 & 425.0 &
Minimum 0.000& 0.000 0.000 0.000 0.000& 68.04 ! 354.7 " 393.1 " 164.9 " 30.30 ! 0.000& 0.000&
Total 0.67& 0.00 0.00 0.00 2110 &20527 !42505 "35825 "10797 " 8233 ! 286.1 & 1699 &
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 333.3 ! ! ... Not reviewed / Quality not known
Ann. Median 32.67 ! " ... Relative Uncertainty +/-10%
Annual Total 121983 ! # ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
Maximum Minimum & ... Relative Uncertainty +/-30%
Daily 7897 ! 0.000!
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1989
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 602.2 "1108 "1071 " 203.2 ! 54.87 $ 16.19 & 0.015& 1
2 0.000 0.000 0.000 0.000 0.000 711.6 "3100 " 947.5 " 184.3 ! 62.97 $ 13.95 & 0.000 2
3 0.000 0.000 0.000 0.000 0.000 589.6 "3984 " 853.8 " 158.5 ! 104.2 # 12.03 & 0.000 3
4 0.000 0.000 0.000 0.000 0.000 483.9 "4152 " 786.6 " 139.1 ! 101.8 " 7.747& 0.000 4
5 0.000 0.000 0.000 0.000 0.000 406.1 "4112 " 705.0 " 127.0 ! 106.0 " 8.049& 0.000 5
6 0.000 0.000 0.000 0.000 0.000 336.5 "3896 " 650.7 " 117.4 ! 93.99 # 8.505& 0.000 6
7 0.000 0.000 0.000 0.000 0.000 276.0 "3653 " 598.8 " 106.1 ! 96.98 " 7.869& 0.000 7
8 0.000 0.000 0.000 0.000 0.000 240.3 "3441 " 551.4 " 102.8 ! 88.22 # 5.714& 0.000 8
9 0.000 0.000 0.000 0.000 0.000 209.7 "3258 " 529.8 " 99.49 ! 73.79 # 6.886& 0.000 9
10 0.000 0.000 0.000 0.000 0.000 181.6 "2953 " 509.3 " 92.82 ! 63.72 # 5.389& 0.000 10
11 0.000 0.000 0.000 0.000 0.000 171.7 "2709 " 490.8 " 87.13 ! 53.28 $ 4.339& 0.000 11
12 0.000 0.000 0.000 0.000 0.000 192.7 "2459 " 469.7 " 85.33 ! 48.99 $ 4.102& 0.000 12
13 0.000 0.000 0.000 0.000 0.000 262.5 "2224 " 447.1 " 86.94 ! 47.23 $ 3.451& 0.000 13
14 0.000 0.000 0.000 0.000 0.000 717.7 "2073 " 421.4 " 83.89 ! 38.44 & 3.692& 0.000 14
15 0.000 0.000 0.000 0.000 0.000 1770 "1897 " 395.0 " 80.78 ! 36.60 $ 2.433& 0.000 15
16 0.000 0.000 0.000 0.000 0.000 1050 "1762 " 361.5 " 82.50 ! 31.65 & 1.799& 0.000 16
17 0.000 0.000 0.000 0.000 0.000 755.4 "1715 " 342.0 " 86.67 ! 34.14 & 1.740& 0.000 17
18 0.000 0.000 0.000 0.000 0.000 818.9 "1574 " 446.6 " 86.81 ! 32.72 & 17.98 & 0.000 18
19 0.000 0.000 0.000 0.000 0.000 713.5 "1419 " 740.5 " 84.41 ! 33.45 $ 27.68 & 0.000 19
20 0.000 0.000 0.000 0.000 0.000 521.4 "1384 "1275 " 80.66 # 33.48 & 20.53 & 0.000 20
21 0.000 0.000 0.000 0.000 0.000 411.8 "1750 "1036 ! 100.6 " 27.37 & 14.14 & 0.000 21
22 0.000 0.000 0.000 0.000 0.000 331.5 "2217 " 766.2 ! 124.5 " 27.76 & 10.73 & 0.000 22
23 0.000 0.000 0.000 0.000 0.361& 286.5 "2038 " 642.7 ! 127.3 " 52.02 $ 9.103& 0.000 23
24 0.000 0.000 0.000 0.000 469.2 $ 262.0 "1691 " 533.7 ! 124.9 " 54.63 $ 7.890& 0.000 24
25 0.000 0.000 0.000 0.000 417.2 " 251.0 "1530 " 397.5 ! 113.7 " 40.46 $ 6.934& 0.000 25
26 0.000 0.000 0.000 0.000 345.6 " 241.9 "1424 " 346.0 ! 94.59 # 35.59 $ 4.950& 0.000 26
27 0.000 0.000 0.000 0.000 261.8 " 238.2 "1446 " 362.2 ! 79.33 # 29.37 & 3.188& 0.000 27
28 0.000 0.000 0.000 0.000 270.2 " 258.6 "1523 " 296.3 ! 70.02 # 24.47 & 1.259& 0.000 28
29 0.000 0.000 0.000 276.6 " 300.7 "1684 " 276.2 ! 64.46 # 23.67 & 0.772& 0.000 29
30 0.000 0.000 0.000 323.1 " 396.1 "1603 " 248.9 ! 60.51 # 20.88 & 0.436& 0.000 30
31 0.000 0.000 571.4 " 1317 " 223.4 ! 18.57 & 0.000 31
Mean 0.000 0.000 0.000 0.000 94.69 & 466.3 "2293 " 571.7 ! 104.5 ! 51.33 & 7.983& 0.000&
Median 0.000 0.000 0.000 0.000 0.000& 334.0 "1897 " 509.3 ! 93.70 ! 40.46 & 6.910& 0.000&
Maximum 0.000 0.000 0.000 0.000 571.4 &1770 "4152 "1275 ! 203.2 ! 106.0 & 27.68 & 0.015&
Minimum 0.000 0.000 0.000 0.000 0.000& 171.7 "1108 " 223.4 ! 60.51 ! 18.57 & 0.436& 0.000&
Total 0.00 0.00 0.00 0.00 2935 &13989 "71097 "17722 ! 3136 ! 1591 & 239.5 & 0.02&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 303.3 ! ! ... Not reviewed / Quality not known
Ann. Median 3.692! " ... Relative Uncertainty +/-10%
Annual Total 110710 ! # ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
Maximum Minimum & ... Relative Uncertainty +/-30%
Daily 4152 ! 0.000!
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1990
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.00 3302 " 720.7 " 36.69$ 149.6 " 146.4 " 89.76" 841.3 " 325.1 " 111.8 " 29.59& 0.00 1
2 0.00 2667 " 628.3 " 33.77& 145.1 " 151.3 " 87.45# 898.1 " 287.0 " 94.63" 26.84& 0.00 2
3 0.00 1384 " 578.2 " 32.03& 140.8 " 145.3 " 86.53# 1012 " 257.2 " 84.84# 27.59& 0.00 3
4 0.00 898.8 " 554.7 " 29.03& 139.6 " 132.0 " 85.24# 2045 " 234.0 " 75.04# 27.01& 0.00 4
5 0.00 641.3 " 505.5 " 26.33& 137.3 " 117.2 " 82.83# 1836 " 211.9 " 69.40# 23.22& 0.00 5
6 0.00 607.6 " 454.8 " 24.77& 133.7 " 148.5 " 80.63# 1553 " 193.5 " 80.46# 22.23& 0.00 6
7 0.00 773.8 " 421.1 " 22.77& 131.2 " 217.3 " 79.46# 1193 " 189.0 " 93.05# 20.04& 0.00 7
8 0.00 1040 " 375.4 " 127.1 $ 128.7 " 283.8 " 79.42# 946.9 " 181.4 " 91.32# 17.62& 0.00 8
9 0.00 1416 " 303.4 " 141.8 " 128.5 " 316.0 " 80.02# 776.2 " 182.6 " 88.68# 15.52& 0.00 9
10 0.00 1766 " 260.4 " 155.2 " 125.7 " 328.1 " 88.12# 675.6 " 215.2 " 117.1 " 13.43& 0.00 10
11 0.00 2664 " 242.7 " 243.2 " 123.5 " 338.4 " 106.1 " 623.1 " 202.9 " 104.8 " 10.98& 0.00 11
12 0.00 3823 " 382.3 " 333.2 " 120.4 " 310.4 " 163.0 " 592.7 " 181.5 " 92.81# 10.28& 0.00 12
13 0.00 3501 " 837.3 " 261.9 " 127.1 " 280.7 " 358.3 " 602.0 " 178.9 " 114.5 " 8.37& 0.00 13
14 0.00 4471 " 441.6 " 195.0 " 132.9 " 283.8 " 413.4 " 574.1 " 164.8 " 152.5 " 7.56& 0.00 14
15 0.00 3879 " 567.4 " 163.5 " 123.8 " 287.1 " 744.3 " 521.6 " 142.3 " 120.7 " 7.21& 0.00 15
16 0.00 3072 " 458.3 " 150.3 " 105.8 " 267.9 " 878.6 " 492.4 " 128.4 " 98.00" 5.59& 0.00 16
17 0.00 3231 " 309.8 " 142.1 " 104.9 " 243.3 " 1313 " 497.4 " 124.2 " 87.81# 4.11& 0.00 17
18 0.00 3001 " 247.6 " 139.6 " 157.9 " 217.4 " 1510 " 543.6 " 132.6 " 73.80# 2.14& 0.00 18
19 0.00 2772 " 208.9 " 152.5 " 146.5 " 190.9 " 1465 " 683.9 " 143.3 " 64.17# 2.02& 0.00 19
20 0.00 2526 " 192.9 " 207.4 " 235.2 " 168.3 " 1056 " 840.5 " 139.4 " 58.00# 2.05& 0.00 20
21 0.00 2236 " 182.9 " 302.4 " 431.1 " 150.4 " 889.8 " 745.7 " 139.4 " 49.62$ 1.37& 0.00 21
22 0.00 2021 " 174.4 " 344.0 " 570.0 " 138.8 " 1227 " 623.0 " 137.9 " 42.43$ 0.91& 0.00 22
23 0.00 1772 " 168.4 " 237.1 " 349.1 " 127.5 " 2498 " 534.8 " 143.1 " 36.32$ 0.40& 0.00 23
24 0.00 1559 " 142.1 " 196.3 " 235.0 " 119.7 " 2966 " 464.0 " 157.9 " 32.45& 0.11& 0.00 24
25 0.00 1330 " 105.3 # 194.1 " 226.7 " 111.3 " 3490 " 406.0 " 239.7 " 30.40& 0.02& 0.00 25
26 0.00 1140 " 79.64# 179.6 " 191.2 " 105.9 " 2765 " 359.2 " 224.9 " 26.92& 0.00& 0.00 26
27 0.00 984.1 " 66.24# 169.8 " 158.1 " 99.74" 2118 " 325.6 " 238.6 " 24.69& 0.00 0.00 27
28 6.02& 838.7 " 54.98$ 161.5 " 144.4 " 95.25" 1503 " 315.8 " 212.3 " 20.70& 0.00 0.00 28
29 3924 " 43.98$ 155.1 " 165.2 " 91.39# 1171 " 326.7 " 182.7 " 24.25& 0.00 0.00 29
30 11985 " 39.80$ 152.7 " 166.9 " 91.78" 1023 " 342.5 " 143.1 " 24.41& 0.00 0.00 30
31 7062 " 38.34$ 143.3 " 930.1 " 357.1 " 28.71& 0.00 31
Mean 741.2 &2118 " 315.7 $ 157.0 & 178.0 " 190.2 # 949.2 # 727.4 " 187.8 " 71.43 & 9.540& 0.000
Median 0.000&1896 " 260.4 $ 155.2 & 143.3 " 150.8 # 878.6 # 602.0 " 182.0 " 75.04 & 6.402& 0.000
Maximum 11985 & 4471 " 837.3 $ 344.0 & 570.0 " 338.4 # 3490 # 2045 " 325.1 " 152.5 & 29.59& 0.00
Minimum 0.000& 607.6 " 38.34 $ 22.77 & 104.9 " 91.39 # 79.42 # 315.8 " 124.2 " 20.70 & 0.000& 0.000
Total 22976 &59317 " 9787 $ 4711 & 5519 " 5706 #29427 #22549 " 5635 " 2214 & 286.2 & 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 460.6 & " ... Relative Uncertainty +/-10%
Ann. Median 143.1 & # ... Relative Uncertainty +/-15%
Annual Total 168127 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 11985 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1991
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 0.000 399.5 "2117 " 332.9 " 79.20 # 6.828& 0.153& 1
2 0.000 0.000 0.000 0.000 0.000 0.000 414.5 "3176 " 300.4 " 69.12 # 6.209& 0.006& 2
3 0.000 0.000 0.000 0.000 0.000 0.000 579.8 "6324 " 278.3 " 56.71 $ 6.673& 0.000 3
4 0.000 0.000 0.000 0.000 0.000 0.000 1191 "6129 " 258.7 " 57.70 $ 10.56 & 0.000 4
5 0.000 0.000 0.000 0.000 0.000 40.02 &1420 "4436 " 240.7 " 56.45 # 16.27 & 0.000 5
6 0.000 0.000 0.000 0.000 0.000 173.4 "1111 "3902 " 229.0 " 53.38 $ 23.61 & 0.000 6
7 0.000 0.000 0.000 0.000 0.000 315.2 " 693.1 "2562 " 225.4 " 49.93 $ 23.68 & 0.000 7
8 0.000 0.000 0.000 0.000 0.000 197.1 " 580.4 "1872 " 246.2 " 47.34 $ 32.59 & 0.000 8
9 0.000 0.000 0.000 0.000 0.000 112.0 " 521.3 "1515 " 375.5 " 47.77 $ 24.74 & 0.000 9
10 0.000 0.000 0.000 0.000 0.000 85.53 # 445.7 "1261 " 474.4 " 44.59 $ 19.20 & 0.000 10
11 0.000 0.000 0.000 0.000 0.000 66.52 # 391.2 "1085 " 590.8 " 37.62 $ 15.67 & 0.000 11
12 0.000 0.000 0.000 0.000 0.000 61.36 # 351.0 " 981.4 " 502.5 " 35.71 & 19.35 & 0.000 12
13 0.000 0.000 0.000 0.000 0.000 70.70 # 331.4 " 861.7 " 378.1 " 33.10 & 19.27 & 0.000 13
14 0.000 0.000 0.000 0.000 0.000 144.5 # 310.3 " 753.9 " 391.3 " 29.74 & 14.89 & 0.000 14
15 0.000 0.000 0.000 0.000 0.000 439.5 " 303.9 " 675.8 " 611.3 " 24.62 & 12.59 & 0.000 15
16 0.000 0.000 0.000 0.000 0.000 529.6 " 414.3 " 629.7 "1137 " 20.92 & 8.752& 0.000 16
17 0.000 0.000 0.000 0.000 0.000 697.4 " 898.2 " 600.9 " 922.5 " 17.48 & 6.341& 0.000 17
18 0.000 0.000 0.000 0.000 0.000 590.9 "1497 " 590.7 " 697.7 " 23.82 & 7.377& 0.000 18
19 0.000 0.000 0.000 0.000 0.000 430.9 "2020 " 587.6 " 504.7 " 22.42 & 6.662& 0.000 19
20 0.000 0.000 0.000 0.000 0.000 284.0 "2824 " 614.3 " 401.4 " 25.07 & 6.211& 0.000 20
21 0.000 0.000 0.000 0.000 0.000 210.6 "3097 " 654.3 " 343.7 " 27.53 & 6.120& 0.000 21
22 0.000 0.000 0.000 0.000 0.000 163.0 "2988 " 605.6 " 300.0 " 24.20 & 5.243& 0.000 22
23 0.000 0.000 0.000 0.000 0.000 148.8 "2065 " 531.8 " 259.7 " 24.30 & 4.611& 0.000 23
24 0.000 0.000 0.000 0.000 0.000 216.5 "1807 " 471.7 " 216.9 " 29.87 & 4.535& 0.000 24
25 0.000 0.000 0.000 0.000 0.000 393.0 "1746 " 428.3 " 183.1 " 31.57 & 4.369& 3.313& 25
26 0.000 0.000 0.000 0.000 0.000 522.0 "1642 " 382.1 " 155.4 " 24.60 & 3.002& 27.70 & 26
27 0.000 0.000 0.000 0.000 0.000 468.6 "1501 " 384.0 " 133.5 " 20.10 & 2.739& 8.953& 27
28 0.000 0.000 0.000 0.000 0.000 551.9 "1378 " 378.9 " 115.8 " 17.40 & 1.867& 13.60 & 28
29 0.000 0.000 0.000 0.000 476.7 "1238 " 534.9 " 99.70 # 12.90 & 1.162& 11.40 & 29
30 0.000 0.000 0.000 0.000 500.9 "1342 " 483.4 " 88.67 # 11.11 & 0.642& 6.527& 30
31 0.000 0.000 0.000 1769 " 393.0 " 9.181& 3.707& 31
Mean 0.000 0.000 0.000 0.000 0.000 263.0 &1202 "1481 " 366.5 # 34.37 & 10.73 & 2.431&
Median 0.000 0.000 0.000 0.000 0.000 203.9 &1191 " 654.3 " 300.2 # 29.74 & 6.751& 0.000&
Maximum 0.000 0.000 0.000 0.000 0.000 697.4 &3097 "6324 "1137 # 79.20 & 32.59 & 27.70 &
Minimum 0.000 0.000 0.000 0.000 0.000 0.000& 303.9 " 378.9 " 88.67 # 9.181& 0.642& 0.000&
Total 0.00 0.00 0.00 0.00 0.00 7891 &37270 "45923 "10996 # 1065 & 321.8 & 75.36&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 283.7 & " ... Relative Uncertainty +/-10%
Ann. Median 2.739& # ... Relative Uncertainty +/-15%
Annual Total 103542 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 6324 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1992
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 1.806& 0.000 0.000 0.000 20.06 & 36.21 $2649 " 537.8 "3705 "1467 " 58.34 # 44.37 $ 1
2 0.610& 0.000 0.000 0.031& 18.98 & 33.23 $2319 "1021 "3408 "1437 " 51.53 $ 40.87 $ 2
3 0.092& 0.000 0.000 7.795& 16.94 & 31.60 $1965 "1305 "3186 "1486 " 49.99 $ 40.54 $ 3
4 0.006& 0.000 0.000 23.80 & 16.65 & 30.30 &1488 "1881 "3823 "1491 " 54.76 $ 37.21 $ 4
5 0.000 0.000 0.000 19.90 & 22.40 & 29.57 &1181 "2021 "4996 "1368 " 60.93 $ 35.23 $ 5
6 0.000 0.000 0.000 30.22 & 29.21 & 27.77 & 956.6 "2056 "4549 "1245 " 56.51 $ 31.55 & 6
7 0.000 0.000 0.000 26.33 & 25.53 & 26.12 & 760.6 "2253 "4476 "1132 " 47.25 $ 29.48 & 7
8 0.000 0.000 0.000 31.12 & 23.71 & 25.16 & 661.9 "1794 "3707 "1095 " 45.55 $ 21.72 & 8
9 0.000 0.000 0.000 140.4 $ 21.10 & 23.40 & 597.1 "2301 "3103 "1032 " 45.67 $ 16.67 & 9
10 0.000 0.000 0.000 208.3 $ 19.63 & 22.83 & 592.8 "2726 "3001 " 973.7 " 48.01 $ 8.740& 10
11 0.000 0.000 0.000 570.2 " 25.19 & 27.65 & 659.6 "3280 "3201 " 922.6 " 49.41 $ 8.682& 11
12 0.000 0.000 0.000 399.3 " 38.31 $ 43.05 &1054 "2741 "3100 " 883.1 " 53.28 $ 10.30 & 12
13 0.000 0.000 0.000 254.9 " 42.80 $ 100.5 #1140 "1929 "3020 " 873.7 " 60.73 # 7.586& 13
14 0.000 0.000 0.000 163.9 " 32.88 $ 205.1 "1632 "1603 "2984 " 864.6 " 55.98 & 4.496& 14
15 0.000 0.000 0.000 109.5 " 29.94 & 578.8 "2518 "1504 "2846 " 836.5 " 246.8 # 1.389& 15
16 0.000 0.000 0.000 84.47 # 25.87 & 708.7 "1918 "1814 "2870 " 866.0 " 138.1 " 0.420& 16
17 0.000 0.000 0.000 68.07 # 22.50 & 635.2 "1237 "1854 "2870 " 897.3 " 114.1 " 0.058& 17
18 0.000 0.000 0.000 60.51 $ 20.82 & 819.6 "1150 "1974 "2851 " 706.9 " 68.91 $ 0.019& 18
19 0.000 0.000 0.000 46.10 $ 19.44 & 864.8 "1629 "1526 "3075 " 447.5 " 72.42 # 0.000& 19
20 0.000 0.000& 0.000 43.67 $ 21.03 & 982.1 "1535 "1362 "3161 " 293.0 " 96.01 # 0.000 20
21 0.000 0.000 0.000 44.07 $ 17.81 & 743.9 "2215 "1386 "3156 " 222.9 " 86.33 # 0.000 21
22 0.000 0.000 0.000 39.53 $ 17.81 & 625.6 "2043 "1903 "3129 " 183.5 " 68.63 # 0.000 22
23 0.000 0.000 0.000 39.02 $ 18.92 & 629.4 "1387 "2325 "2912 " 159.9 " 56.29 $ 0.000 23
24 0.000 0.000 0.000 40.47 $ 18.22 & 599.0 "1098 "2540 "2727 " 137.9 " 53.97 $ 0.000 24
25 0.000 0.000 0.000 37.03 $ 22.61 & 451.7 " 933.9 "2692 "2497 " 111.4 " 60.30 $ 0.000 25
26 0.000 0.000 0.000 32.36 & 21.69 & 400.8 " 794.9 "3061 "2202 " 91.23 # 57.51 # 0.000 26
27 0.000 0.000 0.000 25.74 & 22.75 & 414.6 " 671.0 "3402 "1989 " 84.27 # 56.77 # 0.000 27
28 0.000 0.000 0.000 24.13 & 30.54 & 583.3 " 662.2 "3856 "1792 " 83.37 # 52.57 $ 0.000 28
29 0.000 0.000 0.000 26.86 & 36.32 $1412 " 666.4 "4425 "1653 " 87.13 # 51.48 $ 0.000 29
30 0.000 0.000 25.88 & 41.02 $3305 " 602.7 "5275 "1555 " 72.72 # 48.36 $ 0.000 30
31 0.000 0.000 39.39 $ 567.5 "4040 " 65.47 # 0.000 31
Mean 0.081& 0.000& 0.000 87.45 & 25.16 & 480.6 &1267 "2335 "3051 " 697.3 # 68.88 & 10.95 &
Median 0.000& 0.000& 0.000 39.28 & 22.50 & 407.7 &1140 "2021 "3047 " 864.6 # 56.40 & 0.420&
Maximum 1.806& 0.000& 0.000 570.2 & 42.80 &3305 &2649 "5275 "4996 "1491 # 246.8 & 44.37 &
Minimum 0.000& 0.000& 0.000 0.000& 16.65 & 22.83 & 567.5 " 537.8 "1555 " 65.47 # 45.55 & 0.000&
Total 2.51& 0.00& 0.00 2624 & 780.1 &14417 &39287 "72390 "91543 "21616 # 2067 & 339.3 &
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 669.6 & " ... Relative Uncertainty +/-10%
Ann. Median 44.22 & # ... Relative Uncertainty +/-15%
Annual Total 245065 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 5275 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1993
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 18.47 & 28.26 & 169.4 "1156 " 927.0 " 675.5 " 192.5 " 20.98 & 13.55 & 1
2 0.000 0.000 0.000 15.86 & 40.45 $ 168.3 "1006 " 679.7 " 543.9 " 235.6 " 21.94 & 10.61 & 2
3 0.000 0.000 0.000 14.96 & 102.9 $ 187.9 " 813.6 " 574.3 " 427.7 " 281.3 " 21.23 & 8.062& 3
4 0.000 0.000 0.000 13.56 & 171.1 " 175.0 " 827.4 " 513.5 " 406.8 " 249.9 " 18.98 & 4.356& 4
5 0.000 0.000 0.000 13.73 & 253.9 " 138.5 " 734.7 " 597.3 " 589.7 " 240.5 " 20.18 & 2.010& 5
6 0.000 0.000 0.000 14.47 & 242.8 " 108.4 " 526.2 "1091 "1065 " 211.0 " 16.97 & 0.757& 6
7 0.000 0.000 0.000 14.36 & 171.2 " 88.85 # 436.6 "2000 "1060 " 174.0 " 14.72 & 0.127& 7
8 0.000 0.000 0.000 14.04 & 152.2 " 93.14 # 384.5 "2627 "1345 " 143.5 " 13.05 & 0.009& 8
9 0.000 0.000 0.000 13.32 & 140.0 " 104.2 " 329.9 "1932 "1623 " 127.0 " 27.57 & 0.000& 9
10 0.000 0.000 0.000 13.06 & 117.9 " 155.0 " 293.3 "1710 "1514 " 109.7 " 46.74 & 0.000 10
11 0.000 0.000 0.000 17.26 & 93.68 " 184.0 " 277.4 "1445 " 914.9 " 96.26 # 68.25 & 0.000 11
12 0.000 0.000 0.000 29.12 & 82.96 # 172.0 " 458.3 "1102 " 685.0 " 82.85 # 120.7 # 0.000 12
13 0.000 0.000 0.000 34.26 $ 76.46 # 135.7 " 694.2 " 977.6 " 602.2 " 73.26 # 52.38 $ 0.000 13
14 0.000 0.000 0.000 36.14 $ 68.62 # 110.6 " 769.6 " 951.1 " 545.4 " 72.59 # 41.23 & 0.000 14
15 0.000 2.829& 0.000 42.35 $ 59.86 $ 93.55 # 615.4 " 815.8 " 519.2 " 68.81 # 36.12 $ 0.000 15
16 0.000 13.79 & 0.000 50.31 $ 52.26 $ 84.51 # 449.6 " 649.9 " 461.1 " 63.00 # 34.93 $ 0.000 16
17 0.000 11.45 & 0.000 53.57 $ 47.33 $ 82.06 # 524.4 " 603.3 " 429.7 " 57.15 # 33.36 $ 0.000 17
18 0.000 10.46 & 0.000 53.78 $ 47.23 $ 100.3 # 585.4 " 994.2 " 452.2 " 53.07 $ 36.19 $ 0.000 18
19 0.000 9.561& 0.000 52.75 $ 44.38 $ 129.4 " 532.1 " 989.1 " 491.4 " 48.08 $ 34.62 $ 0.000 19
20 0.000 5.809& 0.023& 50.40 $ 40.95 $ 137.8 " 475.6 " 805.0 " 482.9 " 44.80 $ 136.8 $ 0.000 20
21 0.000 2.551& 18.79 & 44.63 $ 48.21 $ 126.8 " 429.2 " 723.6 " 430.2 " 39.70 $ 134.3 " 0.000 21
22 0.000 1.766& 742.2 & 40.62 $ 51.23 $ 115.5 " 404.9 " 617.6 " 355.0 " 35.98 $ 87.63 # 0.000 22
23 0.000 0.982& 386.8 " 37.71 $ 39.67 $ 103.7 " 397.8 " 534.7 " 305.9 " 32.06 & 67.05 # 0.000 23
24 0.000 0.279& 206.2 " 36.16 $ 37.93 $ 91.60 " 395.2 " 485.8 " 274.7 " 31.55 $ 56.81 $ 0.000 24
25 0.000 0.026& 126.1 " 33.34 $ 42.58 $ 108.2 " 380.9 " 454.9 " 241.1 " 30.56 & 46.90 $ 0.000 25
26 0.000 0.000& 86.33 # 30.68 & 43.43 $ 229.3 " 357.4 " 433.6 " 214.5 " 27.51 & 39.27 $ 0.000 26
27 0.000 0.000 62.22 # 27.14 & 46.64 $ 435.3 " 353.2 " 529.7 " 196.2 " 23.20 & 32.85 $ 0.000 27
28 0.000 0.000 47.14 $ 24.06 & 55.57 $ 915.0 " 356.2 " 704.5 " 179.6 " 25.30 & 28.63 & 0.000 28
29 0.000 35.93 $ 20.10 & 59.90 #1531 " 409.3 " 572.6 " 175.1 " 24.65 & 20.91 & 0.000 29
30 0.000 27.95 & 18.03 & 110.6 #1548 " 651.4 " 513.0 " 170.1 " 21.70 & 18.16 & 0.000 30
31 0.000 21.75 & 114.6 " 865.3 " 583.0 " 19.85 & 0.000 31
Mean 0.000 2.125& 56.82 & 29.27 & 86.61 & 260.8 # 544.8 " 907.7 " 579.3 " 94.74 & 44.98 & 1.274&
Median 0.000 0.000& 0.000& 28.13 & 59.86 & 132.5 # 458.3 " 704.5 " 472.0 " 63.00 & 34.77 & 0.000&
Maximum 0.000 13.79 & 742.2 & 53.78 & 253.9 &1548 #1156 "2627 "1623 " 281.3 & 136.8 & 13.55 &
Minimum 0.000 0.000& 0.000& 13.06 & 28.26 & 82.06 # 277.4 " 433.6 " 170.1 " 19.85 & 13.05 & 0.000&
Total 0.00 59.50& 1761 & 878.2 & 2685 & 7824 #16890 "28139 "17378 " 2937 & 1349 & 39.48&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 219.0 & " ... Relative Uncertainty +/-10%
Ann. Median 47.14 & # ... Relative Uncertainty +/-15%
Annual Total 79940 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 2627 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1994
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 461.8 " 856.3 " 279.0 " 204.8 " 31.97 & 3.855& 0.000 1
2 0.000 0.000 0.000 0.000 0.000 498.6 "1301 " 254.7 " 233.2 " 31.28 & 4.908& 0.000 2
3 0.000 0.000 0.000 0.000 0.000 644.9 "1958 " 234.4 " 254.5 " 32.12 & 2.339& 0.000 3
4 0.000 0.000 0.000 0.000 0.000 749.6 "1859 " 333.6 " 256.1 " 32.86 & 1.484& 0.000 4
5 0.000 0.000 0.000 0.000 0.000 637.1 "1443 " 658.3 " 265.3 " 28.89 & 1.139& 0.000 5
6 0.000 0.000 0.000 0.000 0.000 520.4 "1195 "1291 " 275.2 " 31.02 & 1.177& 0.000 6
7 0.000 0.000 0.000 0.000 0.000 439.6 " 962.8 "1235 " 229.5 " 29.70 & 1.040& 0.000 7
8 0.000 0.000 0.000 0.000 0.000 323.8 " 803.1 " 710.2 " 185.9 " 27.43 & 0.645& 0.000 8
9 0.000 0.000 0.000 0.000 0.000 247.2 " 863.6 " 527.6 " 158.6 " 26.21 & 0.243& 0.000 9
10 0.000 0.000 0.000 0.000 0.000 206.8 "1111 " 506.5 " 161.5 " 25.13 & 0.031& 0.000 10
11 0.000 0.000 0.000 0.000 0.000 173.1 "1409 "1131 " 221.3 " 24.22 & 0.000& 0.000 11
12 0.000 0.000 0.000 0.000 0.000 155.7 "1234 "3825 " 277.5 " 23.32 & 0.000 0.000 12
13 0.000 0.000 0.000 0.000 0.000 141.3 " 952.2 "2002 " 696.8 " 20.56 & 0.000 0.000 13
14 0.000 0.000 0.000 0.000 0.000 128.0 " 849.8 "1243 " 473.7 " 25.86 & 0.000 0.000 14
15 0.000 0.000 0.000 0.000 0.000 114.8 " 818.1 " 915.5 " 311.0 " 23.28 & 0.000 0.000 15
16 0.000 0.000 0.000 0.000 0.000 104.4 " 802.5 " 729.1 " 231.8 " 20.35 & 0.000 0.000 16
17 0.000 0.000 0.000 0.000 0.000 96.00 " 719.4 " 596.2 " 184.8 " 18.72 & 0.000 0.000 17
18 0.000 0.000 0.000 0.000 0.000 90.44 " 636.1 " 508.1 " 161.0 " 17.45 & 0.000 0.000 18
19 0.000 0.000 0.000 0.000 0.000 102.5 " 589.2 " 440.9 " 135.7 " 17.63 & 0.000 0.000 19
20 0.000 0.000 0.000 0.000 0.000 155.9 " 543.1 " 388.7 " 114.2 " 16.42 & 0.000 0.000 20
21 0.000 0.000 0.000 0.000 0.000 430.0 " 495.5 " 344.9 " 95.95 # 14.72 & 0.000 0.000 21
22 0.000 0.000 0.000 0.000 0.000 1130 " 457.4 " 314.3 " 83.94 # 12.93 & 0.000 0.000 22
23 0.000 0.000 0.000 0.000 0.000 1623 " 445.1 " 288.2 " 72.41 # 10.82 & 0.000 0.000 23
24 0.000 0.000 0.000 0.000 0.000 1432 " 512.4 " 270.1 " 63.35 # 8.648& 0.000 0.000 24
25 0.000 0.000 0.000 0.000 0.000 1070 " 929.4 " 254.4 " 56.15 $ 8.601& 0.000 0.000 25
26 0.000 0.000 0.000 0.000 0.000 874.6 " 851.4 " 237.5 " 48.40 $ 8.087& 0.000 0.000 26
27 0.000 0.000 0.000 0.000 1.255& 741.3 " 632.4 " 219.0 " 43.30 $ 7.741& 0.000 0.000 27
28 0.000 0.000 0.000 0.000 249.1 # 637.9 " 498.0 " 201.1 " 40.20 $ 7.148& 0.000 0.000 28
29 0.000 0.000 0.000 571.7 " 600.4 " 435.1 " 185.6 " 37.05 $ 7.968& 0.000 0.000 29
30 0.000 0.000 0.000 1013 " 577.1 " 373.5 " 180.1 " 33.39 & 4.450& 0.000 0.000 30
31 0.000 0.000 718.5 " 316.8 " 188.1 " 2.488& 0.000 31
Mean 0.000 0.000 0.000 0.000 82.38 & 503.6 " 866.3 " 661.1 " 186.9 & 19.29 & 0.562& 0.000
Median 0.000 0.000 0.000 0.000 0.000& 450.7 " 818.1 " 388.7 " 173.2 & 20.35 & 0.000& 0.000
Maximum 0.000 0.000 0.000 0.000 1013 &1623 "1958 "3825 " 696.8 & 32.86 & 4.908& 0.000
Minimum 0.000 0.000 0.000 0.000 0.000& 90.44 " 316.8 " 180.1 " 33.39 & 2.488& 0.000& 0.000
Total 0.00 0.00 0.00 0.00 2554 &15109 "26855 "20494 " 5606 & 598.0 & 16.86& 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 195.2 & " ... Relative Uncertainty +/-10%
Ann. Median 0.000& # ... Relative Uncertainty +/-15%
Annual Total 71233 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 3825 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1995
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 49.89 $ 196.3 "2837 " 479.1 " 97.38 " 61.46 # 2.686& 1
2 0.000 0.000 0.000 0.000 0.000 42.45 $ 183.8 "2102 " 452.7 " 87.49 # 53.29 $ 2.328& 2
3 0.000 0.000 0.000 0.000 0.000 38.00 $ 174.6 "1722 " 578.7 " 79.77 # 47.34 $ 0.955& 3
4 0.000 0.000 0.000 0.000 0.000 37.23 $ 165.6 "1415 " 679.1 " 69.38 # 45.17 $ 0.191& 4
5 0.000 0.000 0.000 0.000 0.000 45.26 & 158.9 "1185 " 506.8 " 63.53 # 44.74 $ 0.037& 5
6 0.000 0.000 0.000 0.000 0.000 52.42 $ 173.4 "1031 " 712.2 " 58.95 # 49.32 $ 0.004& 6
7 0.000 0.000 0.000 0.000 0.000 93.66 # 243.6 " 847.6 " 863.2 " 53.69 $ 44.72 $ 0.000 7
8 0.000 0.000 0.000 0.000 0.000 504.8 " 393.1 " 721.0 " 972.3 " 48.03 $ 38.43 & 0.000 8
9 0.000 0.000 0.000 0.000 0.000 1567 " 681.5 " 773.9 "1202 " 43.53 $ 36.32 $ 0.000 9
10 0.000 0.000 0.000 0.000 0.000 2199 " 933.7 " 944.7 " 753.0 " 42.07 $ 34.08 $ 0.000 10
11 0.000 0.000 0.000 0.000 0.000 1967 "1918 "1266 " 539.8 " 37.32 & 26.09 & 0.000 11
12 0.000 0.000 0.000 0.000 132.3 &1272 "2921 "1213 " 461.4 " 35.79 $ 21.97 & 0.000 12
13 0.000 0.000 0.000 0.000 88.66 # 900.7 "3518 "2301 " 540.7 " 33.74 $ 25.09 & 0.000 13
14 0.000 0.000 0.000 0.000 74.48 # 644.8 "3043 "1775 " 504.9 " 31.36 & 23.21 & 0.000 14
15 0.000 0.000 0.000 0.000 50.88 $ 475.6 "2358 "1982 " 640.0 " 28.21 & 20.75 & 0.000 15
16 0.000 0.000 0.000 0.000 35.48 $ 360.4 "2158 "1450 " 553.7 " 27.04 & 19.85 & 0.000 16
17 0.000 0.000 0.000 0.000 32.85 & 286.2 "1821 "1124 " 402.4 " 79.42 & 17.93 & 0.000 17
18 0.000 0.000 0.000 0.000 26.72 & 235.3 "1483 " 995.7 " 320.1 " 737.4 " 14.59 & 0.000 18
19 0.000 0.000 0.000 0.000 25.52 & 197.1 "1166 " 906.1 " 276.3 "2391 " 13.25 & 0.000 19
20 0.000 0.000 0.000 0.000 28.17 & 218.7 "2859 "1037 " 242.7 "2975 " 11.99 & 0.000 20
21 0.000 0.000 0.000 0.000 48.77 $ 276.5 "6387 " 967.7 " 218.1 "1721 " 11.02 & 0.000 21
22 0.000 0.000 0.000 0.000 52.74 $ 267.6 "7308 " 952.8 " 191.5 " 960.6 " 10.57 & 0.000 22
23 0.000 0.000 0.000 0.000 171.2 # 284.9 "3900 " 877.8 " 168.4 " 732.1 " 8.271& 0.000 23
24 0.000 0.000 0.000 0.000 211.5 " 328.2 "2447 " 806.9 " 148.2 " 514.1 " 7.906& 0.000 24
25 0.000 0.000 0.000 0.000 173.9 " 317.8 "4295 " 775.8 " 132.0 " 363.9 " 6.671& 0.000 25
26 0.000 0.000 0.000 0.000 121.6 " 393.0 "5144 " 738.6 " 117.9 " 270.5 " 5.572& 0.000 26
27 0.000 0.000 0.000 0.000 170.9 " 317.5 "5099 " 707.0 " 108.8 " 207.0 " 6.267& 0.000 27
28 0.000 0.000 0.000 0.000 130.4 " 275.9 "2847 " 653.6 " 105.8 " 146.8 " 4.948& 0.000 28
29 0.000 0.000 0.000 92.08 # 240.1 "3018 " 599.7 " 108.3 " 110.9 " 4.132& 0.000 29
30 0.000 0.000 0.000 71.24 # 214.3 "4012 " 558.0 " 107.5 " 89.25 # 3.560& 0.000 30
31 0.000 0.000 61.08 # 3993 " 519.3 " 74.74 # 0.000 31
Mean 0.000 0.000 0.000 0.000 58.08 & 470.1 &2419 "1154 " 436.2 " 393.9 & 23.95 & 0.200&
Median 0.000 0.000 0.000 0.000 35.48 & 280.7 &2358 " 967.7 " 457.0 " 79.77 & 20.30 & 0.000&
Maximum 0.000 0.000 0.000 0.000 211.5 &2199 &7308 "2837 "1202 "2975 & 61.46 & 2.686&
Minimum 0.000 0.000 0.000 0.000 0.000& 37.23 & 158.9 " 519.3 " 105.8 " 27.04 & 3.560& 0.000&
Total 0.00 0.00 0.00 0.00 1800 &14103 &75002 "35787 "13087 "12211 & 718.5 & 6.20&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 418.4 & " ... Relative Uncertainty +/-10%
Ann. Median 26.09 & # ... Relative Uncertainty +/-15%
Annual Total 152716 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 7308 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1996
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.00 0.00 0.00 0.00 0.00 0.00 1536 "12981 " 801.8 " 632.6 " 70.99# 17.33& 1
2 0.00 0.00 0.00 0.00 0.00 0.00 1424 " 9410 " 718.6 " 488.2 " 62.21# 17.07& 2
3 0.00 0.00 0.00 0.00 0.00 0.00 1761 " 7290 " 655.6 " 421.4 " 52.70$ 14.78& 3
4 0.00 0.00 0.00 0.00 0.00 2.47& 2191 " 5835 " 610.8 " 361.9 " 43.03$ 12.79& 4
5 0.00 0.00 0.00 0.00 0.00 45.02& 2196 " 5822 " 555.0 " 320.2 " 39.70$ 11.45& 5
6 0.00 0.00 0.00 0.00 0.00 39.33$ 1542 " 6417 " 519.5 " 287.4 " 145.7 $ 11.22& 6
7 0.00 0.00 0.00 0.00 0.00 34.03& 1092 " 5757 " 518.6 " 262.4 " 591.7 " 12.81& 7
8 0.00 0.00 0.00 0.00 0.00 30.87& 1198 " 4126 " 517.6 " 234.6 " 1047 " 14.12& 8
9 0.00 0.00 0.00 0.00 0.00 22.00& 1576 " 3381 " 505.0 " 208.7 " 774.8 " 11.91& 9
10 0.00 0.00 0.00 0.00 0.00 23.65& 2009 " 2898 " 598.8 " 187.7 " 517.6 " 9.82& 10
11 0.00 0.00 0.00 0.00 0.00 25.05& 1414 " 2634 " 1073 " 189.4 " 351.0 " 7.45& 11
12 0.00 0.00 0.00 0.00 0.00 25.25& 984.1 " 2780 " 829.6 " 169.9 " 249.2 " 4.78& 12
13 0.00 0.00 0.00 0.00 0.00 21.19& 822.7 " 3755 " 806.7 " 156.6 " 180.7 " 4.03& 13
14 0.00 0.00 0.00 0.00 0.00 20.01& 725.4 " 3963 " 654.0 " 147.5 " 133.8 " 2.93& 14
15 0.00 0.00 0.00 0.00 0.00 25.31& 717.6 " 4100 " 640.8 " 135.7 " 123.2 " 2.21& 15
16 0.00 0.00 0.00 0.00 0.00 24.33& 1692 " 2902 " 1200 " 127.4 " 136.3 " 1.11& 16
17 0.00 0.00 0.00 0.00 0.00 45.64$ 4290 " 2520 " 929.5 " 113.0 " 153.8 " 0.58& 17
18 0.00 0.00 0.00 0.00 0.00 130.9 #11541 " 2197 " 890.0 " 100.4 " 133.6 " 0.16& 18
19 0.00 0.00 0.00 0.00 0.00 311.9 "12517 " 1929 " 755.5 " 91.96# 113.4 " 0.02& 19
20 0.00 0.00 0.00 0.00 0.00 1226 " 6919 " 1856 " 708.6 " 81.80# 91.62# 0.00& 20
21 0.00 0.00 0.00 0.00 0.00 2105 " 4586 " 2020 " 710.9 " 110.6 # 79.12# 0.00 21
22 0.00 0.00 0.00 0.00 0.00 3321 " 4104 " 2264 " 756.9 " 203.9 " 67.50# 0.00 22
23 0.00 0.00 0.00 0.00 0.00 3708 " 5600 " 2461 " 747.5 " 345.7 " 53.81$ 0.00 23
24 0.00 0.00 0.00 0.00 0.00 2476 " 6355 " 2109 " 688.5 " 410.6 " 42.17$ 0.00 24
25 0.00 0.00 0.00 0.00 0.00 1596 "11981 " 2343 " 661.7 " 361.0 " 35.88& 0.00 25
26 0.00 0.00 0.00 0.00 0.00 1218 "10966 " 2440 " 533.7 " 282.8 " 29.67& 0.00 26
27 0.00 0.00 0.00 0.00 0.00 1093 " 6951 " 1775 " 837.9 " 197.6 " 24.76& 0.00 27
28 0.00 0.00 0.00 0.00 0.00 1807 " 9539 " 1292 " 1110 " 147.5 " 24.58& 0.00 28
29 0.00 0.00 0.00 0.00 0.00 2079 "12764 " 1118 " 1464 " 122.9 " 20.30& 0.00 29
30 0.00 0.00 0.00 0.00 1835 " 7719 " 992.4 " 998.3 " 102.4 " 17.80& 0.00 30
31 0.00 0.00 0.00 10134 " 896.5 " 85.11# 0.00 31
Mean 0.000 0.000 0.000 0.000 0.000 776.4 &4801 "3621 " 766.6 " 228.7 # 180.3 & 5.051&
Median 0.000 0.000 0.000 0.000 0.000 42.17 &2196 "2634 " 714.7 " 189.4 # 85.37 & 1.109&
Maximum 0.00 0.00 0.00 0.00 0.00 3708 &12764 "12981 " 1464 " 632.6 # 1047 & 17.33&
Minimum 0.000 0.000 0.000 0.000 0.000 0.000& 717.6 " 896.5 " 505.0 " 81.80 # 17.80 & 0.000&
Total 0.0 0.0 0.0 0.0 0.0 23292 &148845 "112262 " 22998 " 7089 # 5408 & 156.6&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 874.5 & " ... Relative Uncertainty +/-10%
Ann. Median 13.46 & # ... Relative Uncertainty +/-15%
Annual Total 320051 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 12981 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1997
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 1117 " 41.00 $ 103.2 " 85.27 # 230.7 " 571.9 " 181.9 " 30.19 & 0.001& 1
2 0.000 0.000 0.000 836.2 " 41.94 $ 177.3 " 79.74 # 193.9 " 539.1 " 169.0 " 30.13 & 0.000 2
3 0.000 0.000 0.000 448.9 " 40.04 $ 305.2 " 121.8 " 176.9 " 488.8 " 157.7 " 27.93 & 0.000 3
4 0.000 0.000 0.000 312.7 " 40.40 $ 387.3 " 273.9 " 269.6 " 651.7 " 146.3 " 26.57 & 0.000 4
5 0.000 0.000 0.000 364.6 " 40.52 $ 403.1 " 339.6 " 699.0 " 675.4 " 135.0 " 17.10 & 0.000 5
6 0.000 0.000 0.000 480.1 " 35.01 & 371.8 " 402.9 " 943.9 " 989.8 " 123.0 " 14.49 & 0.000 6
7 0.000 0.000 0.000 339.4 " 32.29 & 325.4 " 390.0 " 975.3 "1257 " 109.0 " 14.02 & 0.000 7
8 0.000 0.000 0.000 302.4 " 30.47 & 283.4 " 372.0 " 807.8 "2317 " 100.9 # 14.75 & 0.000 8
9 0.000 0.000 0.000 402.5 " 29.10 & 287.9 " 320.7 " 745.4 "1507 " 108.3 " 15.10 & 0.000 9
10 0.000 0.000 0.000 279.5 " 27.02 & 329.1 " 292.4 "1423 "1168 " 179.4 " 8.204& 0.000 10
11 0.000 0.000 0.000 242.3 " 28.16 & 299.9 " 256.5 "1395 "1090 " 196.5 " 6.278& 0.000 11
12 0.000 0.000 0.000 189.4 " 32.53 & 298.6 " 203.3 "1391 "1080 " 221.0 " 7.326& 0.000 12
13 0.000 0.000 0.000 187.2 " 39.58 $ 295.9 " 182.9 " 996.6 " 838.3 " 192.3 " 7.973& 0.000 13
14 0.000 0.000 0.000 142.1 " 64.53 $ 247.0 " 253.1 " 703.4 " 691.2 " 165.9 " 7.987& 0.000 14
15 0.000 0.000 0.000 118.6 " 97.02 " 207.9 " 360.4 " 714.2 " 640.1 " 133.6 " 5.937& 0.000 15
16 0.000 0.000 0.000 100.0 " 117.4 " 186.9 " 341.6 " 734.5 " 547.4 " 103.6 " 1.916& 0.000 16
17 0.000 0.000 0.000 88.59 # 101.9 # 165.4 " 311.1 "1427 " 472.4 " 84.81 # 1.029& 0.000 17
18 0.000 0.000 0.000 83.87 # 89.48 # 145.9 " 268.7 "1333 " 416.1 " 69.97 # 0.998& 0.000 18
19 0.000 0.000 0.000 73.95 # 85.93 # 131.1 " 220.6 " 814.5 " 373.1 " 59.36 $ 0.826& 0.000 19
20 0.000 0.000 0.000 62.28 # 90.06 # 120.8 " 182.7 " 600.6 " 341.9 " 51.95 $ 0.484& 0.000 20
21 0.000 0.000 0.000 57.96 # 98.80 " 114.6 " 166.7 " 521.9 " 315.3 " 48.44 $ 0.293& 0.000 21
22 0.000 0.000 0.000 54.38 # 90.03 # 109.4 " 153.6 " 460.1 " 292.8 " 44.96 $ 0.461& 0.000 22
23 0.000 0.000 0.000 51.03 $ 83.72 # 109.5 " 139.3 " 408.9 " 278.0 " 42.43 $ 0.269& 0.000 23
24 0.000 0.000 0.000 49.30 $ 76.68 # 109.5 " 148.9 " 364.2 " 263.8 " 56.28 $ 0.290& 0.000 24
25 0.000 0.000 0.000 47.69 $ 72.19 # 107.8 " 236.7 " 332.5 " 246.7 " 57.57 $ 0.866& 0.000 25
26 0.000 0.000 0.000 44.93 $ 74.58 # 106.1 " 300.5 " 302.6 " 232.4 " 54.35 $ 0.902& 0.000 26
27 0.000 0.000 0.000 40.81 $ 75.08 # 103.6 " 334.5 " 280.9 " 223.0 " 38.72 $ 0.853& 0.000 27
28 0.000 0.000 0.000 37.95 $ 75.82 # 98.40 " 411.8 " 293.4 " 212.3 " 35.81 & 0.650& 0.000 28
29 0.000 0.000 38.42 $ 80.24 # 92.81 " 337.0 " 431.9 " 201.6 " 27.90 & 0.143& 0.000 29
30 0.000 752.6 & 41.24 $ 84.18 # 87.31 # 297.2 " 584.3 " 190.5 " 25.78 & 0.028& 0.000 30
31 0.000 1117 " 89.24 # 265.4 " 759.4 " 29.63 & 0.000 31
Mean 0.000 0.000 60.33 & 221.2 $ 64.67 & 203.7 # 259.7 # 687.6 " 637.1 " 101.7 & 8.133& 0.000&
Median 0.000 0.000 0.000& 109.3 $ 74.58 & 171.4 # 268.7 # 699.0 " 514.0 " 100.9 & 3.926& 0.000&
Maximum 0.000 0.000 1117 &1117 $ 117.4 & 403.1 # 411.8 #1427 "2317 " 221.0 & 30.19 & 0.001&
Minimum 0.000 0.000 0.000& 37.95 $ 27.02 & 87.31 # 79.74 # 176.9 " 190.5 " 25.78 & 0.028& 0.000&
Total 0.00 0.00 1870 & 6635 $ 2005 & 6112 # 8051 #21316 "19112 " 3151 & 244.0 & 0.00&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 187.7 & " ... Relative Uncertainty +/-10%
Ann. Median 57.57 & # ... Relative Uncertainty +/-15%
Annual Total 68497 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 2317 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1998
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000! 0.000! 453.2 " 240.3 "5422 " 314.3 " 12.89 & 0.003& 1
2 0.000 0.000 0.000 0.000 0.000! 0.000! 552.1 " 248.9 "4034 " 294.2 " 12.14 & 0.000 2
3 0.000 0.000 0.000 0.000 0.000! 0.000! 584.4 " 264.3 "4597 " 398.4 " 11.82 & 0.000 3
4 0.000 0.000 0.000 0.000 0.000! 0.000! 525.6 " 283.7 "5781 " 454.3 " 11.16 & 0.000 4
5 0.000 0.000 0.000 0.000 0.000! 0.000! 670.1 " 293.7 "3497 " 336.8 " 10.17 & 0.000 5
6 0.000 0.000 0.000 0.000 0.000! 0.000! 699.9 " 337.2 "2345 " 260.7 " 8.527& 0.000 6
7 0.000 0.000 0.000 0.000 0.000! 0.000! 897.0 " 372.6 "1776 " 195.8 " 8.635& 0.000 7
8 0.000 0.000 0.000 0.000 0.000! 0.000!1129 " 457.0 "1416 " 149.2 " 7.654& 0.000 8
9 0.000 0.000 0.000 0.000 0.000! 0.000!1062 " 439.0 "1155 " 121.5 " 6.641& 0.000 9
10 0.000 0.000 0.000 0.000 0.000! 0.000! 802.4 " 359.4 " 969.0 " 101.8 " 6.623& 0.000 10
11 0.000 0.000 0.000 0.000 0.000! 576.1 ! 684.6 " 306.3 " 811.3 " 92.07 # 5.702& 0.000 11
12 0.000 0.000 0.000 0.000 0.000!1002 ! 629.9 " 282.3 " 691.5 " 85.88 # 4.827& 0.000 12
13 0.000 0.000 0.000 0.000 0.000! 827.2 ! 612.2 " 260.2 " 615.3 " 76.56 # 7.044& 0.000 13
14 0.000 0.000 0.000 0.000 0.000! 837.3 ! 580.8 " 242.1 " 571.3 " 71.51 # 5.106& 0.000 14
15 0.000 0.000 0.000 0.000 0.000! 943.3 ! 545.2 " 222.0 " 527.5 " 64.09 # 3.346& 0.000 15
16 0.000 0.000 0.000 0.000 0.000! 778.5 ! 452.4 " 203.5 " 494.4 " 57.42 $ 3.395& 0.000 16
17 0.000 0.000 0.000 0.000! 0.000! 413.7 ! 359.5 " 192.8 " 461.7 " 57.64 $ 2.846& 0.000 17
18 0.000 0.000 0.000 0.000! 0.000! 426.2 " 319.0 " 231.3 " 439.0 " 78.21 # 1.039& 0.000 18
19 0.000 0.000 0.000 0.000! 0.000! 473.6 " 328.9 " 275.7 " 393.3 " 67.48 # 1.365& 0.000 19
20 0.000 0.000 0.000 0.000! 0.000! 515.9 " 343.0 " 275.4 " 323.9 " 55.03 $ 1.476& 0.000 20
21 0.000 0.000 0.000 0.000! 0.000! 456.1 " 383.3 " 312.3 " 313.2 " 50.40 $ 2.121& 0.000 21
22 0.000 0.000 0.000 0.000! 0.000! 381.7 " 423.4 " 314.7 " 517.0 " 47.01 $ 2.696& 0.000 22
23 0.000 0.000 0.000 0.000! 0.000! 389.9 " 434.6 " 253.4 " 541.1 " 44.20 $ 2.017& 0.000 23
24 0.000 0.000 0.000 0.000! 0.000! 329.0 " 385.1 " 209.0 " 729.6 " 39.98 $ 1.164& 0.000 24
25 0.000 0.000 0.000 0.000! 0.000! 270.8 " 358.2 " 196.0 " 647.5 " 34.79 $ 1.151& 0.000 25
26 0.000 0.000 0.000 0.000! 0.000! 229.1 " 360.0 " 169.6 " 473.1 " 30.18 & 0.206& 0.000 26
27 0.000 0.000 0.000 0.000! 0.000! 231.8 " 381.8 " 178.6 " 388.1 " 25.33 & 0.025& 0.000 27
28 0.000 0.000 0.000 0.000! 0.000! 309.1 " 338.4 " 386.5 " 405.4 " 23.40 & 0.010& 0.000 28
29 0.000 0.000 0.000! 0.000! 402.5 " 307.4 "1533 " 360.9 " 21.42 & 0.011& 0.000 29
30 0.000 0.000 0.000! 0.000! 449.2 " 275.3 "5733 " 337.9 " 19.72 & 0.003& 0.000 30
31 0.000 0.000 0.000! 247.9 "9805 " 15.55 & 0.000 31
Mean 0.000 0.000 0.000 0.000! 0.000! 341.4 ! 520.2 " 802.6 "1368 " 118.9 & 4.727& 0.000&
Median 0.000 0.000 0.000 0.000! 0.000! 355.4 ! 452.4 " 275.7 " 593.3 " 67.48 & 3.371& 0.000&
Maximum 0.000 0.000 0.000 0.000! 0.000!1002 !1129 "9805 "5781 " 454.3 & 12.89 & 0.003&
Minimum 0.000 0.000 0.000 0.000! 0.000! 0.000! 247.9 " 169.6 " 313.2 " 15.55 & 0.003& 0.000&
Total 0.00 0.00 0.00 0.00! 0.00!10243 !16127 "24879 "41034 " 3685 & 141.8 & 0.00&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 263.3 ! ! ... Not reviewed / Quality not known
Ann. Median 0.000! " ... Relative Uncertainty +/-10%
Annual Total 96110 ! # ... Relative Uncertainty +/-15%
$ ... Relative Uncertainty +/-20%
Maximum Minimum & ... Relative Uncertainty +/-30%
Daily 9805 ! 0.000!
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 1999
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.292& 0.000 0.000 0.000 600.0 "1735 "1769 "1193 " 583.2 " 94.03 # 11.43 & 1
2 0.000 0.038& 0.000 0.000 0.000 464.4 "1601 "1538 "1047 " 535.8 " 91.12 # 9.924& 2
3 0.000 0.007& 0.000 0.000 0.000 343.8 "1506 "1338 "1085 " 473.9 " 87.07 # 9.056& 3
4 0.000 0.000 0.000 0.000 0.000 285.4 "1459 "1070 "1505 " 392.5 " 88.93 # 9.211& 4
5 0.000 0.000 0.000 0.000 0.000 233.2 "1674 " 715.4 "2164 " 361.7 " 89.14 # 8.770& 5
6 0.000 0.000 0.000 0.000 0.000 194.7 "2786 " 591.5 "1763 " 341.7 " 82.31 # 5.769& 6
7 0.000 0.000 0.000 0.000 0.000 161.8 "5665 " 608.4 "1159 " 391.5 " 77.24 # 3.695& 7
8 0.000 0.000 0.000 0.000 0.000 137.9 "4382 " 596.5 " 940.4 "1021 " 84.62 # 1.343& 8
9 0.000 0.000 0.000 0.000 0.000 124.1 "3218 " 654.1 " 831.8 "1566 " 80.48 # 0.244& 9
10 0.000 0.000 0.000 0.000 0.000 116.5 "2362 " 593.1 " 757.1 "1732 " 76.78 # 0.015& 10
11 0.000 0.000 0.000 0.000 0.000 127.0 "1952 " 924.7 " 998.9 "1240 " 69.91 # 0.000& 11
12 0.000 0.000 0.000 0.000 0.000 156.3 "1759 "2604 "1551 " 865.0 " 64.68 # 2.508& 12
13 0.000 0.000 0.000 0.000 0.000 135.3 "1706 "2878 "2351 " 692.4 " 57.97 $ 10.50 & 13
14 0.000 0.000 0.000 0.000 0.000 135.0 "2062 "1561 "1747 " 692.9 " 40.55 & 6.377& 14
15 0.000 0.000 0.000 0.000 0.000 233.5 "2579 "1129 "1580 " 888.1 " 36.68 $ 2.611& 15
16 0.000 0.000 0.000 0.000 0.000 521.4 "3728 "1082 "2498 "1904 " 43.30 $ 0.728& 16
17 0.000 0.000 0.000 0.000 0.000 977.5 "3098 "1336 "2400 "1397 " 41.73 $ 0.154& 17
18 0.000 0.000 0.000 0.000 0.000 1539 "3001 "1696 "1424 " 814.7 " 148.1 $ 0.020& 18
19 0.000 0.000 0.000 0.000 0.000 1767 "2171 "4012 "1036 " 607.1 " 239.8 " 0.004& 19
20 0.000 0.000 0.000 0.000 0.000 1710 "1547 "4041 " 846.3 " 490.0 " 153.7 " 0.000 20
21 0.000 0.000 0.000 0.000 14.76 &1574 "1207 "2681 " 782.1 " 406.1 " 108.2 " 0.000 21
22 0.000 0.000 0.000 0.000 12.44 &1357 " 982.3 "2016 " 945.3 " 341.0 " 78.73 # 0.000 22
23 319.6 & 0.000 0.000 0.000 36.33 &1676 " 826.3 "1596 "1155 " 284.2 " 62.19 # 0.000 23
24 178.1 # 0.000 0.000 0.000 35.61 $1880 " 746.9 "1406 "1409 " 220.9 " 51.07 $ 0.000 24
25 36.93 & 0.000 0.000 0.000 29.51 &2165 " 943.2 "1449 "1034 " 173.8 " 39.94 $ 0.000 25
26 14.16 & 0.000 0.000 0.000 38.64 &1887 "1047 "1703 " 798.3 " 149.7 " 32.99 & 0.000 26
27 7.838& 0.000 0.000 0.000 241.8 $1662 "1445 "2131 " 717.2 " 132.0 " 28.04 & 0.000 27
28 5.217& 0.000 0.000 0.000 945.1 "1686 "2220 "1681 " 706.7 " 118.2 " 22.31 & 0.000 28
29 2.136& 0.000 0.000 1275 "1758 "2226 "1304 " 671.6 " 109.0 " 19.07 & 0.000 29
30 0.928& 0.000 0.000 1197 "1845 "2234 "1134 " 620.3 " 103.3 " 11.92 & 169.3 & 30
31 0.917& 0.000 858.3 " 2202 "1151 " 99.28 " 236.2 " 31
Mean 18.25 & 0.012& 0.000 0.000 151.1 & 915.2 "2131 "1580 "1257 " 617.0 " 73.42 & 15.74 &
Median 0.000& 0.000& 0.000 0.000 0.000& 560.7 "1952 "1406 "1066 " 473.9 " 73.35 & 0.244&
Maximum 319.6 & 0.292& 0.000 0.000 1275 &2165 "5665 "4041 "2498 "1904 " 239.8 & 236.2 &
Minimum 0.000& 0.000& 0.000 0.000 0.000& 116.5 " 746.9 " 591.5 " 620.3 " 99.28 " 11.92 & 0.000&
Total 565.9 & 0.34& 0.00 0.00 4684 &27456 "66070 "48987 "37718 "19127 " 2203 & 487.9 &
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 567.9 & " ... Relative Uncertainty +/-10%
Ann. Median 43.30 & # ... Relative Uncertainty +/-15%
Annual Total 207299 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 5665 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2000
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 614.0 " 8625 " 911.3 " 168.6 " 56.88# 37.16& 173.8 " 737.8 " 1271 " 123.9 " 16.43& 0.00 1
2 405.0 " 8134 " 756.4 " 107.5 # 68.73# 35.07& 340.7 " 657.8 " 2047 " 113.7 " 14.75& 0.00 2
3 218.4 " 7812 " 731.7 " 75.66# 76.91# 45.37$ 576.6 " 817.9 " 1569 " 105.9 " 13.56& 0.00 3
4 137.2 " 7914 " 732.1 " 53.37$ 69.76# 158.3 # 1159 " 879.8 " 1015 " 99.98" 12.15& 0.00 4
5 95.61# 7891 " 732.1 " 40.34$ 64.19# 178.2 " 1389 " 992.4 " 847.8 " 93.20# 20.28& 0.00 5
6 62.59$ 7639 " 730.0 " 33.37$ 58.68# 178.6 " 1065 " 1130 " 756.3 " 86.54# 14.55& 0.00 6
7 54.32$ 7203 " 691.0 " 29.68& 53.00$ 178.8 " 1086 " 1265 " 845.0 " 81.30# 12.32& 0.00 7
8 51.77$ 6550 " 483.0 " 27.97& 49.00$ 178.4 " 804.9 " 1654 " 1921 " 76.12# 12.65& 0.00 8
9 101.6 $ 5910 " 364.9 " 25.51& 47.27$ 177.6 " 655.8 " 1251 " 1518 " 72.15# 12.72& 0.00 9
10 95.82# 5255 " 382.2 " 24.78& 46.49$ 183.1 " 605.5 " 959.4 " 937.8 " 67.12# 13.19& 0.00 10
11 61.91$ 4575 " 787.1 " 26.03& 47.49$ 182.8 " 706.5 " 745.4 " 708.8 " 59.30$ 10.36& 0.00 11
12 43.90$ 3987 " 862.3 " 25.21& 46.34$ 182.7 " 750.1 " 639.4 " 572.8 " 54.83$ 5.12& 0.00 12
13 29.47& 3470 " 795.6 " 26.42& 49.28$ 180.3 " 859.4 " 566.8 " 496.1 " 53.57$ 5.00& 0.00 13
14 32.75& 2979 " 618.7 " 27.66& 56.29$ 217.0 " 1114 " 507.7 " 453.3 " 52.45$ 6.37& 0.00 14
15 794.8 # 2567 " 303.6 " 29.25& 75.57# 260.4 " 1205 " 498.6 " 416.0 " 50.58$ 8.23& 0.00 15
16 357.3 " 2255 " 170.4 " 30.45& 77.60# 366.2 " 1470 " 641.4 " 406.8 " 48.60$ 8.20& 0.00 16
17 175.1 " 1995 " 106.5 " 30.95$ 70.99# 309.0 " 1831 " 827.4 " 390.5 " 42.65$ 6.17& 0.00 17
18 299.8 " 1755 " 75.20# 31.02$ 66.23# 230.9 " 2379 " 939.1 " 368.3 " 40.74$ 3.67& 0.00 18
19 228.7 " 1581 " 56.98$ 31.02$ 63.13# 207.5 " 4358 " 922.8 " 326.3 " 39.07$ 2.28& 0.00 19
20 182.6 " 1467 " 47.48$ 31.02$ 59.27$ 227.7 " 3285 " 677.2 " 285.8 " 35.08& 1.95& 0.00 20
21 168.5 " 1425 " 43.95$ 31.02$ 56.31# 228.8 " 2066 " 552.0 " 259.7 " 31.74& 1.66& 0.00 21
22 1046 " 1286 " 38.69$ 31.02$ 54.86$ 245.3 " 1823 " 475.5 " 238.7 " 32.07& 1.24& 0.00 22
23 11510 " 877.0 " 37.91$ 31.02$ 51.23$ 227.9 " 1540 " 427.6 " 219.9 " 32.22& 1.16& 0.00 23
24 12066 " 496.5 " 36.40$ 31.02$ 39.18& 231.5 " 1390 " 407.4 " 205.8 " 29.18& 0.30& 0.00 24
25 8633 " 306.5 " 39.51$ 31.02$ 38.86& 226.8 " 1358 " 390.4 " 188.8 " 25.68& 0.03& 0.00 25
26 10230 " 220.0 " 363.3 # 31.02$ 37.70& 192.9 " 1040 " 462.5 " 171.8 " 22.75& 0.00& 0.00 26
27 13001 " 179.4 " 874.1 " 32.52$ 36.78& 200.7 " 846.6 " 526.8 " 158.7 " 22.65& 0.00& 0.00 27
28 14577 " 167.0 " 957.3 " 46.18$ 46.52$ 191.3 " 741.2 " 528.3 " 148.2 " 24.74& 0.00 0.00 28
29 12991 " 905.3 " 793.6 " 45.02$ 35.11& 172.5 " 707.4 " 596.2 " 139.8 " 20.09& 0.00 0.00 29
30 11089 " 414.6 " 50.25$ 43.68& 153.4 " 691.5 " 597.0 " 132.3 " 14.33& 0.00 0.00 30
31 9695 " 251.3 " 41.00& 786.0 " 702.9 " 15.16& 0.00 31
Mean 3518 &3635 " 457.7 $ 41.20 & 54.33 & 192.9 &1252 " 741.2 " 633.9 " 53.79 & 6.812& 0.000
Median 228.7 &2567 " 414.6 $ 31.02 & 53.00 & 187.2 &1065 " 657.8 " 411.4 " 48.60 & 5.646& 0.000
Maximum 14577 & 8625 " 957.3 $ 168.6 & 77.60& 366.2 & 4358 " 1654 " 2047 " 123.9 & 20.28& 0.00
Minimum 29.47 & 167.0 " 36.40 $ 24.78 & 35.11 & 35.07 & 173.8 " 390.4 " 132.3 " 14.33 & 0.000& 0.000
Total 109050 &105426 " 14189 $ 1236 & 1684 & 5786 & 38806 " 22978 " 19017 " 1667 & 204.4& 0.0
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 874.4 & " ... Relative Uncertainty +/-10%
Ann. Median 168.6 & # ... Relative Uncertainty +/-15%
Annual Total 320045 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 14577 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2001
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 0.000 15.64 &2461 " 199.5 " 288.5 " 14.32 & 0.817& 1
2 0.000 0.000 0.000 0.000 0.000 4.809& 13.46 &1596 " 202.2 " 259.3 " 12.42 & 0.901& 2
3 0.000 0.000 0.000 0.000 0.000 45.97 $ 14.70 & 842.3 " 192.1 " 199.5 " 9.515& 1.198& 3
4 0.000 0.000 0.000 0.000 0.000 33.04 & 13.46 & 633.2 " 170.3 " 146.7 " 6.778& 1.036& 4
5 0.000 0.000 0.000 0.000 0.000 29.58 & 16.40 & 554.4 " 153.3 " 105.9 # 6.656& 0.858& 5
6 0.000 0.000 0.000 0.000 0.000 27.59 & 20.03 & 474.4 " 142.5 " 78.21 # 6.826& 0.322& 6
7 0.000 0.000 0.000 0.000 0.000 28.35 & 34.67 & 407.1 " 136.3 " 63.75 # 5.345& 0.144& 7
8 0.000 0.000 0.000 0.000 0.000 28.54 & 34.88 $ 341.2 " 144.6 " 52.40 $ 3.677& 0.056& 8
9 0.000 0.000 0.000 0.000 0.000 27.24 & 63.60 $ 333.8 " 169.9 " 43.76 $ 3.317& 0.001& 9
10 0.000 0.000 0.000 0.000 0.000 23.54 & 82.45 # 432.2 " 201.2 " 37.53 $ 2.740& 0.000 10
11 0.000 0.000 0.000 0.000 0.000 24.16 & 155.7 " 551.3 " 212.0 " 33.53 & 2.095& 0.000 11
12 0.000 0.000 0.000 0.000 0.000 27.33 & 139.3 " 664.6 " 202.0 " 28.81 & 1.721& 0.000 12
13 0.000 0.000 0.000 0.000 0.000 27.88 & 108.2 " 464.5 " 180.3 " 26.13 & 1.285& 0.000 13
14 0.000 0.000 0.000 0.000 0.000 28.66 & 82.41 # 429.1 " 152.2 " 23.18 & 1.389& 0.000 14
15 0.000 0.000 0.000 0.000 0.000 28.82 & 71.55 # 674.5 " 127.5 " 17.30 & 1.536& 0.000 15
16 0.000 0.000 0.000 0.000 0.000 27.34 & 61.26 #1525 " 110.7 " 17.99 & 1.095& 0.000 16
17 0.000 0.000 0.000 0.000 0.000 22.86 & 53.75 $2389 " 97.99 " 17.29 & 0.406& 0.000 17
18 0.000 0.000 0.000 0.000 0.000 20.57 & 49.27 $1331 " 87.26 # 16.16 & 0.402& 0.000 18
19 0.000 0.000 0.000 0.000 0.000 21.46 & 45.29 $ 859.0 " 76.27 # 17.40 & 6.380& 0.000 19
20 0.000 0.000 0.000 0.000 0.000 22.10 & 42.33 $ 668.2 " 68.54 # 17.41 & 5.212& 0.000 20
21 0.000 0.000 0.000 0.000 0.000 19.83 & 40.28 $ 536.5 " 62.07 # 20.20 & 4.433& 0.000 21
22 0.000 0.000 0.000 0.000 0.000 19.82 & 37.79 $ 449.1 " 67.49 # 19.86 & 3.589& 0.000 22
23 0.000 0.000 0.000 0.000 0.000 17.33 & 35.51 $ 377.9 " 57.35 $ 30.72 & 6.446& 0.000 23
24 0.000 0.000 0.000 0.000 0.000 15.78 & 33.97 $ 336.2 " 82.98 # 30.51 & 5.348& 0.000 24
25 0.000 0.000 0.000 0.000 0.000 17.12 & 32.19 & 344.9 " 94.83 # 42.16 $ 4.928& 0.000 25
26 0.000 0.000 0.000 0.000 0.000 19.07 & 30.71 & 412.7 " 96.36 " 41.58 $ 5.521& 0.000 26
27 0.000 0.000 0.000 0.000 0.000 17.95 & 31.45 & 459.7 " 80.79 # 39.81 $ 5.186& 0.000 27
28 0.000 0.000 0.000 0.000 0.000 15.75 & 31.98 $ 339.6 " 75.59 # 34.12 & 3.657& 0.000 28
29 0.000 0.000 0.000 0.000 16.37 & 47.22 $ 265.9 " 95.20 # 25.87 & 2.992& 0.000 29
30 0.000 0.000 0.000 0.000 15.69 & 229.6 # 237.6 " 249.2 " 20.28 & 1.533& 0.000 30
31 0.000 0.000 0.000 958.5 " 215.2 " 16.91 & 0.000 31
Mean 0.000 0.000 0.000 0.000 0.000 22.48 & 84.76 & 697.0 " 132.9 $ 58.48 & 4.558& 0.172&
Median 0.000 0.000 0.000 0.000 0.000 22.48 & 40.28 & 464.5 " 131.9 $ 30.72 & 4.055& 0.000&
Maximum 0.000 0.000 0.000 0.000 0.000 45.97 & 958.5 &2461 " 249.2 $ 288.5 & 14.32 & 1.198&
Minimum 0.000 0.000 0.000 0.000 0.000 0.000& 13.46 & 215.2 " 57.35 $ 16.16 & 0.402& 0.000&
Total 0.00 0.00 0.00 0.00 0.00 674.5 & 2628 &21607 " 3988 $ 1813 & 136.8 & 5.33&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 84.53 & " ... Relative Uncertainty +/-10%
Ann. Median 0.901& # ... Relative Uncertainty +/-15%
Annual Total 30852 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 2461 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2002
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 6.069& 92.21 # 152.9 " 140.0 " 19.15 & 9.529& 0.000 1
2 0.000 0.000 0.000 0.000 0.000 6.182& 113.5 " 132.4 " 215.8 " 17.87 & 6.588& 0.000 2
3 0.000 0.000 0.000 0.000 0.000 7.735& 159.3 " 115.3 " 203.4 " 16.11 & 8.180& 0.000 3
4 0.000 0.000 0.000 0.000 0.000 11.52 & 160.6 " 116.9 " 333.8 " 14.33 & 7.963& 0.000 4
5 0.000 0.000 0.000 0.000 0.000 37.24 & 155.7 " 138.9 " 396.4 " 16.02 & 6.134& 0.000 5
6 0.000 0.000 0.000 0.000 0.000 32.61 & 136.9 " 156.2 " 264.7 " 16.22 & 4.466& 0.000 6
7 0.000 0.000 0.000 0.000 0.000 59.44 $ 117.1 " 215.0 " 197.6 " 37.86 & 2.670& 0.000 7
8 0.000 0.000 0.000 0.000 0.000 94.84 # 120.2 " 290.1 " 150.1 " 33.78 & 2.809& 0.000 8
9 0.000 0.000 0.000 0.000 0.000 75.67 # 126.7 " 259.9 " 120.1 " 25.09 & 2.321& 0.000 9
10 0.000 0.000 0.000 0.000 0.000 55.33 $ 120.7 " 287.5 " 100.6 " 54.74 $ 2.545& 0.000 10
11 0.000 0.000 0.000 0.000 0.000 41.93 $ 147.6 " 317.8 " 84.71 # 69.47 # 1.549& 0.000 11
12 0.000 0.000 0.000 0.000 0.000 38.18 $ 238.7 " 359.9 " 73.58 # 52.05 $ 0.300& 0.000 12
13 0.000 0.000 0.000 0.000 0.000 37.57 & 366.4 " 373.4 " 65.08 # 39.88 $ 0.120& 0.000 13
14 0.000 0.000 0.000 0.000 0.000 39.93 & 396.2 " 296.8 " 64.99 # 30.75 & 0.024& 0.000 14
15 0.000 0.000 0.000 0.000 0.000 50.58 $ 423.3 " 209.4 " 78.12 # 24.24 & 0.001& 0.000 15
16 0.000 0.000 0.000 0.000 0.000 44.43 $ 335.8 " 166.3 " 113.9 " 19.37 & 0.000 0.000 16
17 0.000 0.000 0.000 0.000 0.000& 41.01 $ 258.1 " 144.2 " 85.89 # 18.11 & 0.000 0.000 17
18 0.000 0.000 0.000 0.000 4.900& 46.03 $ 227.5 " 126.7 " 94.05 # 17.28 & 0.000 0.000 18
19 0.000 0.000 0.000 0.000 12.66 & 58.47 $ 199.2 " 111.1 " 133.6 " 20.84 & 0.000 0.000 19
20 0.000 0.000 0.000 0.000 13.10 & 72.43 # 190.1 " 101.1 " 108.8 " 18.59 & 0.000 0.000 20
21 0.000 0.000 0.000 0.000 11.09 & 59.12 # 191.6 " 92.75 " 79.78 # 13.81 & 0.000 0.000 21
22 0.000 0.000 0.000 0.000 11.89 & 73.39 # 321.4 " 85.25 # 63.36 # 13.94 & 0.000 0.000 22
23 0.000 0.000 0.000 0.000 11.43 & 100.6 # 241.1 " 79.22 # 53.27 $ 14.73 & 0.000 0.000 23
24 0.000 0.000 0.000 0.000 8.143& 99.78 " 190.5 " 74.95 # 47.82 $ 15.34 & 0.000 0.000 24
25 0.000 0.000 0.000 0.000 9.180& 93.09 # 201.9 " 71.98 # 43.85 $ 18.61 & 0.000 0.000 25
26 0.000 0.000 0.000 0.000 8.966& 99.13 " 221.0 " 74.67 # 40.29 $ 13.85 & 0.000 0.000 26
27 0.000 0.000 0.000 0.000 8.340& 83.39 # 253.0 " 77.24 # 36.55 $ 11.57 & 0.000 0.000 27
28 0.000 0.000 0.000 0.000 8.082& 67.85 $ 300.3 " 93.32 # 32.94 $ 10.17 & 0.000 0.000 28
29 0.000 0.000 0.000 7.275& 73.58 # 254.3 " 92.04 # 29.40 & 8.089& 0.000 0.000 29
30 0.000 0.000 0.000 8.418& 89.00 # 208.9 " 114.1 " 26.17 & 7.059& 0.000 0.000 30
31 0.000 0.000 6.791& 185.3 " 139.0 " 6.371& 0.000 31
Mean 0.000 0.000 0.000 0.000 4.202& 56.54 & 214.7 # 163.4 # 116.0 & 22.43 & 1.840& 0.000
Median 0.000 0.000 0.000 0.000 0.000& 56.90 & 199.2 # 132.4 # 85.30 & 17.87 & 0.001& 0.000
Maximum 0.000 0.000 0.000 0.000 13.10 & 100.6 & 423.3 # 373.4 # 396.4 & 69.47 & 9.529& 0.000
Minimum 0.000 0.000 0.000 0.000 0.000& 6.069& 92.21 # 71.98 # 26.17 & 6.371& 0.000& 0.000
Total 0.000 0.000 0.000 0.000 130.3 &1696 &6655 #5066 #3479 & 695.3 & 55.20 & 0.000
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 48.70 & " ... Relative Uncertainty +/-10%
Ann. Median 0.000& # ... Relative Uncertainty +/-15%
Annual Total 17777 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 423.3 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2003
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 12.02 & 33.06 $1635 " 342.6 " 607.2 " 229.1 " 8.049& 0.000 1
2 0.000 0.000 0.000 0.000 11.07 & 33.90 $1086 " 364.5 " 564.8 " 178.6 " 7.709& 0.000 2
3 0.000 0.000 0.000 0.000 10.22 & 36.34 $ 771.9 " 677.0 " 475.0 " 159.2 " 7.155& 0.000 3
4 0.000 0.000 0.000 0.000 10.07 & 39.49 $ 837.5 "1374 " 368.7 " 138.2 " 5.875& 0.000 4
5 0.000 0.000 0.000 7.716& 9.815& 37.42 $ 991.4 "1813 " 317.9 " 123.1 " 7.074& 0.000 5
6 0.000 0.000 0.000 77.60 # 8.181& 33.54 $1313 "1425 " 280.6 " 107.3 " 7.359& 0.000 6
7 0.000 0.000 0.000 52.74 $ 6.968& 32.35 $1245 " 848.1 " 257.7 " 94.23 # 6.480& 0.000 7
8 0.000 0.000 0.000 31.15 & 14.41 & 31.04 $1120 " 653.5 " 242.3 " 82.39 # 5.729& 0.000 8
9 0.000 0.000 0.000 21.42 & 58.17 & 31.34 $ 799.9 " 558.9 " 239.4 " 70.68 # 3.273& 0.000 9
10 0.000 0.000 0.000 46.65 & 94.50 $ 29.89 $ 898.1 " 505.9 " 242.7 " 62.48 # 2.650& 0.000 10
11 0.000 0.000 0.000 79.78 $ 70.85 $ 26.94 &1261 " 787.9 " 307.2 " 56.52 # 2.078& 0.000 11
12 0.000 0.000 0.000 54.13 $ 34.91 & 24.39 &1606 "1348 " 340.9 " 52.23 $ 1.179& 0.000 12
13 0.000 0.000 0.000 45.62 $ 22.20 & 22.73 &2203 "2118 " 413.1 " 47.82 $ 0.854& 0.000 13
14 0.000 0.000 0.000 41.17 $ 20.92 & 21.78 &1463 "1604 " 436.3 " 45.24 $ 0.233& 0.000 14
15 0.000 0.000 0.000 115.1 # 60.97 & 20.73 &1236 "1125 " 351.0 " 44.32 $ 0.017& 0.000 15
16 0.000 0.000 0.000 106.6 " 89.73 # 19.23 &1099 " 970.5 " 290.1 " 40.31 $ 0.115& 0.000 16
17 0.000 0.000 0.000 87.30 # 223.3 " 17.90 &1013 " 890.3 " 243.8 " 35.47 & 4.785& 0.000 17
18 0.000 0.000 0.000 83.54 # 142.3 " 17.03 & 808.7 " 816.7 " 209.9 " 32.20 & 4.453& 0.000 18
19 0.000 0.000 0.000 67.96 # 109.1 " 16.41 & 671.2 " 819.8 " 184.7 " 30.43 & 5.367& 0.000 19
20 0.000 0.000 0.000 54.64 $ 94.15 # 17.64 & 595.2 " 901.8 " 162.8 " 27.72 & 3.896& 0.000 20
21 0.000 0.000 0.000 50.04 $ 90.27 # 17.57 & 538.1 " 891.0 " 164.3 " 24.92 & 3.618& 0.000 21
22 0.000 0.000 0.000 44.88 $ 97.13 # 30.44 & 493.9 "1464 " 227.0 " 21.45 & 2.678& 0.000 22
23 0.000 0.000 0.000 36.26 $ 121.0 " 30.41 & 458.7 "1836 " 298.2 " 19.84 & 1.815& 0.000 23
24 0.000 0.000 0.000 32.56 $ 88.31 # 38.97 $ 427.8 "2160 " 385.1 " 17.53 & 0.984& 0.000 24
25 0.000 0.000 0.000 29.69 & 70.13 # 62.81 $ 396.4 "1635 " 474.1 " 15.65 & 0.601& 0.000 25
26 0.000 0.000 0.000 23.42 & 62.31 # 76.42 # 350.9 "1161 " 472.4 " 12.51 & 0.181& 0.000 26
27 0.000 0.000 0.000 18.86 & 56.25 # 267.6 " 317.3 " 988.1 " 345.8 " 15.33 & 0.053& 0.000 27
28 0.000 0.000 0.000 16.96 & 52.74 $ 735.7 " 301.8 " 858.1 " 259.2 " 25.64 & 0.001& 0.000 28
29 0.000 0.000 15.03 & 46.15 $1377 " 283.2 " 770.2 " 221.6 " 18.25 & 0.000& 0.000 29
30 0.000 0.000 12.98 & 41.91 $1800 " 289.6 " 700.6 " 283.5 " 10.82 & 0.000 0.000 30
31 0.000 0.000 37.37 $ 352.8 " 646.9 " 8.954& 0.000 31
Mean 0.000 0.000 0.000 41.79 & 60.24 & 166.0 & 866.6 "1066 " 322.2 " 59.63 & 3.142& 0.000
Median 0.000 0.000 0.000 38.71 & 56.25 & 31.19 & 808.7 " 891.0 " 294.2 " 40.31 & 2.664& 0.000
Maximum 0.000 0.000 0.000 115.1 & 223.3 &1800 &2203 "2160 " 607.2 " 229.1 & 8.049& 0.000
Minimum 0.000 0.000 0.000 0.000& 6.968& 16.41 & 283.2 " 342.6 " 162.8 " 8.954& 0.000& 0.000
Total 0.00 0.00 0.00 1254 & 1868 & 4981 &26865 "33056 " 9667 " 1848 & 94.26& 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 218.2 & " ... Relative Uncertainty +/-10%
Ann. Median 20.73 & # ... Relative Uncertainty +/-15%
Annual Total 79633 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 2203 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2004
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 0.000 81.76 # 143.5 " 489.4 " 38.04 $ 12.52 & 0.000 1
2 0.000 0.000 0.000 0.000 0.000 0.000 82.62 # 221.5 " 394.6 " 35.14 $ 9.933& 0.000 2
3 0.000 0.000 0.000 0.000 0.000 0.000 103.6 # 291.2 " 330.1 " 32.66 $ 7.642& 0.000 3
4 0.000 0.000 0.000 0.000 0.000 0.000 122.8 " 304.3 " 286.8 " 30.17 & 6.899& 0.000 4
5 0.000 0.000 0.000 0.000 0.000 0.000 112.0 " 288.1 " 270.8 " 26.94 & 5.960& 0.000 5
6 0.000 0.000 0.000 0.000 0.000 0.000 126.2 " 263.8 " 411.7 " 25.70 & 4.618& 0.000 6
7 0.000 0.000 0.000 0.000 0.000 5.337& 204.0 " 291.0 " 577.3 " 21.59 & 4.296& 0.000 7
8 0.000 0.000 0.000 0.000 0.000 174.2 " 622.8 " 255.7 " 487.3 " 21.77 & 3.525& 0.000 8
9 0.000 0.000 0.000 0.000 0.000 114.4 # 556.0 " 225.3 " 409.2 " 16.75 & 2.219& 0.000 9
10 0.000 0.000 0.000 0.000 0.000 69.57 $ 541.7 " 195.0 " 344.7 " 14.08 & 2.650& 0.000 10
11 0.000 0.000 0.000 0.000 0.000 178.5 # 499.7 " 170.8 " 280.8 " 14.55 & 2.257& 0.000 11
12 0.000 0.000 0.000 0.000 0.000 416.5 " 367.6 " 268.2 " 236.4 " 14.32 & 1.777& 0.000 12
13 0.000 0.000 0.000 0.000 0.000 291.2 " 288.2 " 438.4 " 200.9 " 22.86 & 1.291& 0.000 13
14 0.000 0.000 0.000 0.000 0.000 221.2 " 247.5 " 484.1 " 177.4 " 22.45 & 1.270& 0.000 14
15 0.000 0.000 0.000 0.000 0.000 204.7 " 209.0 " 646.4 " 160.3 " 16.72 & 0.957& 0.000 15
16 0.000 0.000 0.000 0.000 0.000 205.6 " 171.0 " 494.1 " 146.3 " 16.10 & 0.655& 0.000 16
17 0.000 0.000 0.000 0.000 0.000 154.9 " 141.4 " 350.0 " 155.9 " 14.42 & 0.361& 0.000 17
18 0.000 0.000 0.000 0.000 0.000 114.6 " 123.8 " 286.9 " 136.7 " 12.01 & 0.002& 0.000 18
19 0.000 0.000 0.000 0.000 0.000 93.68 # 110.9 " 264.0 " 118.8 " 10.27 & 0.000 0.000 19
20 0.000 0.000 0.000 0.000 0.000 77.22 # 106.0 " 230.6 " 105.3 " 8.780& 0.000 0.000 20
21 0.000 0.000 0.000 0.000 0.000 67.53 # 113.2 " 216.7 " 93.60 # 17.82 & 0.000 0.000 21
22 0.000 0.000 0.000 0.000 0.000 62.27 # 145.8 " 223.2 " 83.58 # 34.30 & 0.000 0.000 22
23 0.000 0.000 0.000 0.000 0.000 68.23 # 150.9 " 245.1 " 73.89 # 96.13 $ 0.000 0.000 23
24 0.000 0.000 0.000 0.000 0.000 77.30 # 141.3 " 443.3 " 65.63 # 61.94 $ 0.000 0.000 24
25 0.000 0.000 0.000 0.000 0.000 75.11 # 159.3 " 525.0 " 59.69 # 76.21 # 0.000 0.000 25
26 0.000 0.000 0.000 0.000 0.000 66.41 # 160.5 " 558.3 " 57.35 # 46.65 $ 0.000 0.000 26
27 0.000 0.000 0.000 0.000 0.000 70.14 # 141.5 " 679.4 " 53.20 $ 30.75 & 0.000 0.000 27
28 0.000 0.000 0.000 0.000 0.000 77.66 # 123.0 "1040 " 48.59 $ 24.85 & 0.000 0.000 28
29 0.000 0.000 0.000 0.000 0.000 93.41 # 107.6 " 992.2 " 44.31 $ 20.34 & 0.000 0.000 29
30 0.000 0.000 0.000 0.000 83.12 # 103.7 " 900.7 " 40.55 $ 18.43 & 0.000 0.000 30
31 0.000 0.000 0.000 104.6 " 675.7 " 15.59 & 0.000 31
Mean 0.000 0.000 0.000 0.000 0.000 102.1 & 202.3 # 406.9 " 211.4 $ 27.69 & 2.294& 0.000
Median 0.000 0.000 0.000 0.000 0.000 77.26 & 141.4 # 291.0 " 158.1 $ 21.77 & 0.806& 0.000
Maximum 0.000 0.000 0.000 0.000 0.000 416.5 & 622.8 #1040 " 577.3 $ 96.13 & 12.52 & 0.000
Minimum 0.000 0.000 0.000 0.000 0.000 0.000& 81.76 # 143.5 " 40.55 $ 8.780& 0.000& 0.000
Total 0.00 0.00 0.00 0.00 0.00 3063 & 6270 #12613 " 6341 $ 858.3 & 68.83& 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 79.82 & " ... Relative Uncertainty +/-10%
Ann. Median 0.000& # ... Relative Uncertainty +/-15%
Annual Total 29214 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 1040 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2005
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 5.339& 316.7 "1176 " 295.9 " 413.3 " 174.6 " 25.64 & 0.000 1
2 0.000 0.000 0.000 130.5 & 11.53 & 270.1 "1066 " 293.9 " 355.3 " 212.9 " 22.50 & 0.000 2
3 0.000 0.000 0.000 500.3 " 11.99 & 237.1 " 947.1 " 369.0 " 307.2 " 223.1 " 20.09 & 0.000 3
4 0.000 0.000 0.000 599.3 " 313.7 & 334.9 " 901.7 " 379.6 " 274.4 " 231.9 " 17.14 & 0.000 4
5 0.000 0.000 0.000 426.0 " 466.1 " 611.0 "1277 " 406.6 " 255.8 " 230.3 " 18.50 & 0.000 5
6 0.000 0.000 0.000 246.1 " 365.8 " 614.9 "1715 " 407.9 " 322.8 " 197.2 " 15.44 & 0.000 6
7 0.000 0.000 0.000 142.3 " 229.7 " 568.8 "1336 " 342.9 " 492.3 " 182.4 " 15.07 & 0.000 7
8 0.000 0.000 0.000 92.66 # 147.0 "1003 "1001 " 294.8 " 904.1 " 239.3 " 13.59 & 0.000 8
9 0.000 0.000 0.000 66.85 # 101.9 "1881 " 865.2 " 268.8 "1005 " 327.6 " 11.80 & 0.000 9
10 0.000 0.000 0.000 50.65 $ 77.54 #2669 " 725.1 " 249.6 " 749.5 " 281.9 " 11.18 & 0.000 10
11 0.000 0.000 0.000 38.72 $ 63.71 #3205 " 625.1 " 234.8 " 651.1 " 201.4 " 10.71 & 0.000 11
12 0.000 0.000 0.000 29.49 & 65.94 #2982 " 561.4 " 225.3 " 569.1 " 155.0 " 9.297& 0.000 12
13 0.000 0.000 0.000 22.60 & 77.53 #2418 " 525.3 " 273.6 " 436.8 " 125.0 " 8.080& 0.000 13
14 0.000 0.000 0.000 17.77 & 78.42 #2033 " 533.6 " 378.2 " 362.4 " 105.0 " 6.736& 0.000 14
15 0.000 0.000 0.000 14.80 & 57.87 $1637 " 515.4 " 499.9 " 328.0 " 90.50 # 6.178& 0.000 15
16 0.000 0.000 0.000 11.95 & 101.0 #1296 " 531.5 " 609.9 " 293.5 " 84.78 # 5.420& 0.000 16
17 0.000 0.000 0.000 10.04 & 221.7 "1716 " 541.9 " 761.1 " 305.4 " 76.81 # 3.739& 0.000 17
18 0.000 0.000 0.000 9.242& 316.5 "1947 " 516.4 "1492 " 479.2 " 80.89 # 3.301& 0.000 18
19 0.000 0.000 0.000 8.163& 540.5 "2188 " 480.4 "2102 " 589.7 " 64.64 # 2.726& 0.000 19
20 0.000 0.000 0.000 7.984& 986.0 "1998 " 455.1 "2183 " 719.4 " 54.97 $ 2.505& 0.000 20
21 0.000 0.000 0.000 6.109&1978 "1674 " 532.1 "1374 " 537.5 " 50.71 $ 1.150& 0.000 21
22 0.000 0.000 0.000 4.727&1879 "1408 " 634.9 " 967.0 " 408.0 " 49.85 $ 0.734& 0.000 22
23 0.000 0.000 0.000 4.392&2009 "1301 " 656.0 " 819.6 " 354.7 " 53.63 $ 0.286& 0.000 23
24 0.000 0.000 0.000 3.460&2086 "2646 " 650.6 " 679.7 " 321.2 " 45.93 $ 0.150& 0.000 24
25 0.000 0.000 0.000 4.351&1804 "3682 " 533.3 " 606.8 " 272.7 " 41.07 $ 0.022& 0.000 25
26 0.000 0.000 0.000 4.105&1803 "3419 " 470.2 " 554.4 " 236.3 " 41.94 $ 0.000& 0.000 26
27 0.000 0.000 0.000 3.450&1198 "2578 " 441.1 " 505.1 " 198.2 " 42.79 $ 0.000 0.000 27
28 0.000 0.000 0.000 2.145& 801.4 "2101 " 410.4 " 480.9 " 176.0 " 40.37 $ 0.000 0.000 28
29 0.000 0.000 1.390& 600.7 "1560 " 378.3 " 471.1 " 162.3 " 36.56 $ 0.000 0.000 29
30 0.000 0.000 3.722& 477.2 "1287 " 348.0 " 447.3 " 162.9 " 32.09 & 0.000 0.000 30
31 0.000 0.000 386.5 " 319.7 " 426.1 " 28.46 & 0.000 31
Mean 0.000 0.000 0.000 82.11 & 621.4 &1720 " 699.1 " 625.8 " 421.5 " 122.7 & 7.733& 0.000
Median 0.000 0.000 0.000 10.99 & 316.5 &1695 " 541.9 " 447.3 " 355.0 " 84.78 & 5.799& 0.000
Maximum 0.000 0.000 0.000 599.3 &2086 &3682 "1715 "2183 "1005 " 327.6 & 25.64 & 0.000
Minimum 0.000 0.000 0.000 0.000& 5.339& 237.1 " 319.7 " 225.3 " 162.3 " 28.46 & 0.000& 0.000
Total 0.00 0.00 0.00 2463 &19262 &51585 "21671 "19401 "12645 " 3804 & 232.0 & 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 359.1 & " ... Relative Uncertainty +/-10%
Ann. Median 45.93 & # ... Relative Uncertainty +/-15%
Annual Total 131064 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 3682 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2006
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 436.8 " 9.752& 0.000 7.567& 20.87 & 62.33 $ 106.9 " 285.3 " 98.42 # 15.87 & 0.000 1
2 0.000 417.5 " 8.912& 0.000 9.752& 20.30 & 79.12 # 102.8 " 324.5 " 66.94 # 12.73 & 0.000 2
3 0.000 375.6 " 7.768& 0.000 11.37 & 21.26 & 65.24 # 95.70 " 411.4 " 59.58 # 10.43 & 0.000 3
4 0.000 290.5 " 7.599& 0.000 11.04 & 22.27 & 58.71 # 86.48 # 432.3 " 53.59 $ 9.078& 0.000 4
5 0.000 203.1 " 6.562& 0.000 9.155& 22.76 & 52.78 $ 79.08 # 355.6 " 51.77 $ 10.26 & 0.000 5
6 0.000 163.1 " 4.303& 0.000 9.358& 21.20 & 51.50 $ 71.88 # 285.0 " 45.16 $ 9.142& 0.000 6
7 0.000 174.2 " 3.895& 0.000 9.779& 17.90 & 49.92 $ 72.21 # 239.4 " 38.15 $ 8.571& 0.000 7
8 0.000 185.7 " 3.430& 0.000 10.73 & 17.49 & 44.55 $ 114.2 # 237.9 " 38.66 $ 5.698& 0.000 8
9 483.5 & 223.8 " 2.517& 0.001& 10.34 & 17.22 & 42.48 $ 143.4 " 293.4 " 36.90 $ 3.516& 0.000 9
10 599.4 " 146.8 " 1.923& 1.777& 10.85 & 17.85 & 39.79 $ 129.0 " 308.5 " 34.90 $ 1.930& 0.000 10
11 191.0 " 103.0 # 0.989& 6.007& 11.00 & 18.16 & 38.87 $ 114.0 " 315.3 " 31.59 & 1.480& 0.000 11
12 172.1 " 80.99 # 0.548& 6.622& 11.05 & 17.77 & 38.20 $ 95.10 " 337.9 " 27.15 & 0.738& 0.000 12
13 790.4 " 65.88 # 0.405& 6.168& 10.95 & 20.82 & 35.73 $ 90.84 # 378.1 " 24.72 & 0.213& 0.000 13
14 2048 " 68.21 # 0.502& 5.218& 10.14 & 22.45 & 33.34 $ 86.58 # 397.2 " 21.89 & 0.036& 0.000 14
15 1542 " 60.35 $ 0.181& 6.338& 11.85 & 21.11 & 31.99 $ 93.17 # 370.0 " 21.24 & 0.005& 0.000 15
16 1030 " 51.46 $ 0.066& 6.762& 12.68 & 20.15 & 34.65 $ 147.4 " 309.1 " 19.01 & 0.000& 0.000 16
17 1726 " 44.29 $ 0.017& 5.573& 16.24 & 20.57 & 34.61 $ 225.4 " 258.4 " 17.72 & 0.000 0.000 17
18 1694 " 38.45 $ 0.002& 6.449& 15.18 & 21.95 & 32.64 $ 298.4 " 246.7 " 17.93 & 0.000 0.000 18
19 998.8 " 31.77 & 0.000 6.301& 11.57 & 24.59 & 32.37 $ 269.2 " 249.3 " 18.87 & 0.000 0.000 19
20 692.9 " 26.40 & 0.000 6.618& 11.34 & 16.94 & 31.38 & 397.7 " 232.1 " 18.51 & 0.000 0.000 20
21 557.6 " 26.93 & 0.000 6.488& 12.72 & 16.17 & 28.85 & 515.7 " 211.5 " 18.57 & 0.000 0.000 21
22 497.7 " 29.13 & 0.000 6.218& 17.61 & 20.27 & 60.84 $ 529.1 " 195.9 " 20.23 & 0.000 0.000 22
23 596.9 " 29.44 & 0.000 4.324& 19.95 & 25.11 & 91.28 # 678.9 " 177.8 " 19.68 & 0.000 0.000 23
24 628.5 " 20.75 & 0.000 4.114& 17.44 & 24.45 & 84.38 # 918.1 " 158.0 " 18.95 & 0.000 0.000 24
25 654.4 " 16.87 & 0.000 4.627& 17.59 & 29.69 & 117.4 " 856.6 " 132.2 " 18.98 & 0.000 0.000 25
26 646.7 " 12.59 & 0.000 4.334& 18.55 & 29.07 & 159.8 " 679.3 " 120.1 " 20.85 & 0.000 0.000 26
27 629.1 " 11.48 & 0.000 4.854& 16.82 & 32.33 & 155.6 " 506.5 " 110.2 " 19.29 & 0.000 0.000 27
28 584.1 " 9.754& 0.000 7.008& 15.80 & 30.11 & 186.0 " 411.5 " 100.4 " 19.04 & 0.000 0.000 28
29 462.0 " 0.000 7.790& 17.38 & 38.12 $ 191.1 " 334.0 " 90.95 # 21.04 & 0.000 0.000 29
30 451.7 " 0.000 7.773& 17.56 & 55.77 $ 147.0 " 279.2 " 87.27 # 17.87 & 0.000 0.000 30
31 446.4 " 0.000 18.63 & 126.0 " 257.4 " 16.72 & 0.000 31
Mean 584.6 & 119.5 & 1.915& 4.046& 13.29 & 23.49 & 72.21 & 283.4 # 255.0 # 30.77 & 2.990& 0.000
Median 557.6 & 63.12 & 0.066& 5.036& 11.57 & 21.15 & 51.50 & 147.4 # 253.8 # 21.04 & 0.003& 0.000
Maximum 2048 & 436.8 & 9.752& 7.790& 19.95 & 55.77 & 191.1 & 918.1 # 432.3 # 98.42 & 15.87 & 0.000
Minimum 0.000& 9.754& 0.000& 0.000& 7.567& 16.17 & 28.85 & 71.88 # 87.27 # 16.72 & 0.000& 0.000
Total 18124 & 3345 & 59.37& 121.4 & 412.0 & 704.7 & 2239 & 8786 # 7651 # 953.9 & 89.70& 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 116.4 & " ... Relative Uncertainty +/-10%
Ann. Median 19.04 & # ... Relative Uncertainty +/-15%
Annual Total 42486 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 2048 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2007
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 41.91 & 111.7 "1759 " 589.2 " 109.9 " 8.975& 0.000 1
2 0.000 0.000 0.000 0.000 0.000 123.1 " 182.9 "2457 " 595.0 " 91.16 # 7.549& 0.000 2
3 0.000 0.000 0.000 0.000 0.000 82.84 # 294.6 "1748 " 444.6 " 78.38 # 6.746& 0.000 3
4 0.000 0.000 0.000 0.000 0.000 63.32 # 543.8 "1323 " 357.1 " 66.50 # 6.068& 0.000 4
5 0.000 0.000 0.000 0.000 0.000 47.12 $ 722.4 " 949.7 " 314.5 " 57.49 # 5.403& 0.000 5
6 0.000 0.000 0.000 0.000 0.000 37.41 $ 666.5 " 733.7 " 286.0 " 48.62 $ 5.020& 0.000 6
7 0.000 0.000 0.000 0.000 0.000 33.29 & 437.2 " 739.0 " 267.1 " 43.51 $ 3.628& 0.000 7
8 0.000 0.000 0.000 0.000 0.000 28.74 & 310.2 " 717.3 " 292.4 " 57.36 $ 3.508& 0.000 8
9 0.000 0.000 0.000 0.000 0.000 26.13 & 246.3 "1020 " 302.3 " 135.2 # 2.270& 0.000 9
10 0.000 0.000 0.000 0.000 0.000 23.57 & 201.2 " 789.8 " 359.5 " 168.1 " 1.732& 0.000 10
11 0.000 0.000 0.000 0.000 0.000 23.38 & 170.3 " 825.2 " 396.1 " 200.5 " 1.334& 0.000 11
12 0.000 0.000 0.000 0.000 0.000 22.31 & 150.4 " 847.6 " 400.9 " 222.4 " 1.035& 0.000 12
13 0.000 0.000 0.000 0.000 0.000 21.15 & 140.0 "1058 " 534.1 " 173.4 " 0.878& 0.000 13
14 0.000 0.000 0.000 0.000 0.000 23.12 & 121.3 " 764.7 " 578.8 " 121.1 " 0.427& 0.000 14
15 0.000 0.000 0.000 0.000 0.000 22.55 & 95.15 # 552.4 " 851.2 " 90.06 # 0.105& 0.000 15
16 0.000 0.000 0.000 0.000 0.000 19.24 & 77.14 # 456.6 " 684.5 " 72.59 # 0.007& 0.000 16
17 0.000 0.000 0.000 0.000 0.000 16.43 & 69.33 # 397.6 " 550.3 " 60.08 $ 0.000& 0.000 17
18 0.000 0.000 0.000 0.000 0.000 142.8 & 63.23 # 340.3 " 448.7 " 49.50 $ 0.000 0.000 18
19 0.000 0.000 0.000 0.000 0.000 104.5 # 66.85 # 317.0 " 353.2 " 40.26 $ 0.000 0.000 19
20 0.000 0.000 0.000 0.000 0.000 69.35 # 75.27 # 531.5 " 290.3 " 31.61 & 0.000 0.000 20
21 0.000 0.000 0.000 0.000 0.000 51.82 $ 146.2 " 765.3 " 246.9 " 26.63 & 0.000 0.000 21
22 0.000 0.000 0.000 0.000 0.000 50.61 & 225.9 " 873.3 " 204.9 " 22.00 & 0.000 0.000 22
23 0.000 0.000 0.000 0.000 0.000 51.02 $ 419.9 "1142 " 177.2 " 17.90 & 0.000 0.000 23
24 0.000 0.000 0.000 0.000 0.000 40.75 $ 582.7 " 919.5 " 156.5 " 15.64 & 0.000 0.000 24
25 0.000 0.000 0.000 0.000 0.000 58.07 $ 826.5 " 957.4 " 158.2 " 13.83 & 0.000 0.000 25
26 0.000 0.000 0.000 0.000 0.000 60.95 #1013 " 777.4 " 154.2 " 12.68 & 0.000 0.000 26
27 0.000 0.000 0.000 0.000 0.000 164.7 #1209 " 620.3 " 154.2 " 13.37 & 0.000 0.000 27
28 0.000 0.000 0.000 0.000 0.000 153.2 "1370 " 517.9 " 193.3 " 11.76 & 0.000 0.000 28
29 0.000 0.000 0.000 0.000 107.7 "1238 " 513.0 " 169.1 " 14.15 & 0.000 0.000 29
30 0.000 0.000 0.000 0.000 99.11 "1275 " 615.0 " 134.4 " 12.14 & 0.000 0.000 30
31 0.000 0.000 0.000 1691 " 542.0 " 10.33 & 0.000 31
Mean 0.000 0.000 0.000 0.000 0.000 60.34 & 475.6 # 857.1 " 354.8 " 67.36 & 1.823& 0.000
Median 0.000 0.000 0.000 0.000 0.000 48.86 & 246.3 # 765.3 " 308.4 " 49.50 & 0.056& 0.000
Maximum 0.000 0.000 0.000 0.000 0.000 164.7 &1691 #2457 " 851.2 " 222.4 & 8.975& 0.000
Minimum 0.000 0.000 0.000 0.000 0.000 16.43 & 63.23 # 317.0 " 134.4 " 10.33 & 0.000& 0.000
Total 0.00 0.00 0.00 0.00 0.00 1810 &14743 #26571 "10645 " 2088 & 54.69& 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 153.2 & " ... Relative Uncertainty +/-10%
Ann. Median 0.000& # ... Relative Uncertainty +/-15%
Annual Total 55912 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 2457 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2008
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 45.21 $ 73.06 # 521.1 "9244 " 247.2 " 277.8 " 145.0 " 38.97 $ 1
2 0.000 0.000 0.000 0.000 47.83 $ 78.31 # 442.0 "5551 " 219.4 " 241.2 " 138.9 " 39.33 $ 2
3 0.000 0.000 0.000 25.19 & 41.46 $ 84.37 # 373.5 "3800 " 206.9 " 206.9 " 131.2 " 36.64 & 3
4 0.000 0.000 0.000 19.33 & 31.25 & 176.8 # 311.0 "2981 " 191.4 " 178.3 " 120.3 " 31.03 & 4
5 0.000 0.000 0.000 34.25 & 25.36 & 216.9 " 247.7 "2171 " 179.9 " 153.9 " 112.8 " 28.66 & 5
6 0.000 0.000 0.000 47.00 & 22.82 & 143.6 " 208.2 "1548 " 172.4 " 134.4 " 110.5 " 19.82 & 6
7 0.000 0.000 0.000 84.93 $ 18.25 & 101.0 " 179.9 "1235 " 177.4 " 121.2 " 105.3 " 21.40 & 7
8 0.000 0.000 0.000 241.5 # 14.79 & 77.13 # 151.4 "1029 " 170.6 " 110.3 " 95.43 # 15.82 & 8
9 0.000 0.000 0.000 193.5 " 14.51 & 77.81 # 136.1 " 882.4 " 158.4 " 101.5 " 70.86 # 9.162& 9
10 0.000 0.000 0.000 101.9 # 12.30 & 66.48 # 124.7 " 768.9 " 141.1 " 95.34 " 56.47 $ 12.12 & 10
11 0.000 0.000 0.000 57.27 $ 9.619& 70.43 # 131.5 " 674.9 " 123.8 " 88.35 # 46.68 $ 26.34 & 11
12 0.000 0.000 0.000 36.98 $ 8.781& 69.89 # 135.8 " 601.1 " 115.7 " 82.69 # 38.91 $ 11.92 & 12
13 0.000 0.000 0.000 24.10 & 8.241& 61.83 # 134.6 " 540.8 " 111.3 " 79.60 # 33.00 & 6.577& 13
14 0.000 0.000 0.000 15.82 & 7.279& 66.12 # 143.3 " 489.4 " 109.5 " 75.87 # 27.36 & 3.391& 14
15 0.000 0.000 0.000 11.86 & 7.517& 76.20 # 169.2 " 445.9 " 113.1 " 72.35 # 20.76 & 1.936& 15
16 0.000 0.000 0.000 10.51 & 7.200& 79.35 # 249.1 " 404.3 " 108.6 " 66.28 # 16.99 & 0.461& 16
17 0.000 0.000 0.000 25.11 & 7.605& 101.7 " 394.2 " 366.3 " 108.3 " 64.71 # 14.88 & 0.045& 17
18 0.000 0.000 0.000 25.42 & 8.004& 94.02 " 700.4 " 334.0 " 114.7 " 62.89 # 14.80 & 0.000& 18
19 0.000 0.000 0.000 67.54 # 10.57 & 99.47 "1376 " 306.9 " 121.2 " 60.61 # 14.44 & 0.000 19
20 0.000 0.000 0.000 57.83 $ 13.21 & 126.1 "1676 " 290.0 " 108.4 " 61.26 $ 13.10 & 0.000 20
21 0.000 0.000 0.000 91.50 # 13.48 & 111.6 "2173 " 274.0 " 96.95 # 59.42 $ 12.65 & 0.000 21
22 0.000 0.000 0.000 73.32 # 16.61 & 89.05 #1401 " 261.3 " 91.07 # 57.16 $ 12.85 & 0.000 22
23 0.000 0.000 0.000 56.99 $ 14.51 & 74.21 # 983.5 " 253.6 " 95.12 # 55.10 $ 19.62 & 0.000 23
24 0.000 0.000 0.000 45.03 $ 20.34 & 62.75 # 909.1 " 238.2 " 89.73 # 69.25 $ 16.90 & 0.000 24
25 0.000 0.000 0.000 36.10 $ 39.16 & 55.56 $ 995.9 " 224.5 " 163.7 # 90.40 # 16.86 & 0.000 25
26 0.000 0.000 0.000 29.41 & 126.7 " 55.45 $1850 " 213.4 " 356.9 " 117.8 " 20.62 & 0.000 26
27 0.000 0.000 0.000 25.11 & 96.91 # 68.26 #1585 " 209.0 " 383.2 " 108.1 " 21.29 & 0.000 27
28 0.000 0.000 0.000 24.14 & 82.68 # 69.03 #1528 " 207.4 " 485.3 " 78.74 # 52.05 $ 0.000 28
29 0.000 0.000 0.000 27.79 & 74.31 # 164.4 #1903 " 266.8 " 490.4 "1454 # 45.74 $ 0.000 29
30 0.000 0.000 36.98 $ 69.45 # 360.9 "2650 " 282.7 " 350.8 " 430.7 " 39.83 $ 0.000 30
31 0.000 0.000 67.40 # 5275 " 287.2 " 195.3 " 0.000 31
Mean 0.000 0.000 0.000 50.88 & 31.72 & 101.7 $ 937.4 "1174 " 186.7 # 162.9 $ 52.87 & 9.794&
Median 0.000 0.000 0.000 35.18 & 16.61 & 78.06 $ 442.0 " 404.3 " 149.7 # 90.40 $ 35.95 & 0.461&
Maximum 0.000 0.000 0.000 241.5 & 126.7 & 360.9 $5275 "9244 " 490.4 #1454 $ 145.0 & 39.33 &
Minimum 0.000 0.000 0.000 0.000& 7.200& 55.45 $ 124.7 " 207.4 " 89.73 # 55.10 $ 12.65 & 0.000&
Total 0.00 0.00 0.00 1526 & 983.4 & 3052 $29058 "36383 " 5602 # 5051 $ 1586 & 303.6 &
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 228.3 & " ... Relative Uncertainty +/-10%
Ann. Median 46.21 & # ... Relative Uncertainty +/-15%
Annual Total 83547 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 9244 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2009
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 312.1 " 0.000 0.000 0.000 0.000 619.9 " 699.4 " 607.5 " 245.1 " 34.49 $ 4.967& 1
2 0.000 186.9 " 0.000 0.000 0.000 0.000 666.4 " 641.4 " 563.6 " 230.9 " 32.68 & 2.071& 2
3 0.000 100.3 # 88.80 & 0.000 0.000 0.000 642.9 " 599.2 " 543.2 " 225.1 " 31.10 & 0.965& 3
4 0.000 59.45 $ 103.7 $ 0.000 0.000 0.000 454.8 " 559.6 " 508.8 " 205.8 " 28.34 & 0.440& 4
5 0.000 38.33 $ 30.49 & 0.000 0.000 0.000 326.2 " 521.5 " 476.8 " 172.6 " 24.38 & 0.112& 5
6 0.000 23.12 & 13.20 & 0.000 0.000 0.000 297.8 " 503.6 " 462.1 " 144.9 " 20.34 & 0.010& 6
7 0.000 13.50 & 19.21 & 0.000 0.000 0.000 354.2 " 501.0 " 427.2 " 125.4 " 15.82 & 0.000 7
8 0.000 9.129& 16.32 & 0.000 0.000 0.000 348.8 " 483.8 " 421.7 " 111.4 " 13.77 & 0.000 8
9 0.000 6.662& 10.83 & 0.000 0.000 0.000 341.8 " 562.1 " 421.6 " 101.2 " 14.65 & 0.000 9
10 0.000 4.737& 7.451& 0.000 0.000 0.000 566.0 " 574.4 " 440.9 " 91.99 # 22.42 & 0.000 10
11 0.000 3.777& 6.042& 0.000 0.000 0.000 854.1 " 542.2 " 510.4 " 83.37 # 9.887& 0.000 11
12 0.000 2.691& 4.977& 0.000 0.000 0.000 942.6 " 544.8 " 745.8 " 75.27 # 17.32 & 0.000 12
13 0.000 1.041& 3.141& 0.000 0.000 0.000 897.1 " 542.6 " 690.9 " 69.93 # 19.38 & 0.000 13
14 0.000 0.450& 1.979& 0.000 0.000 0.000 648.1 " 568.2 " 996.7 " 63.51 # 11.55 & 0.000 14
15 0.000 0.349& 1.661& 0.000 0.000 0.000 479.3 " 834.0 " 944.4 " 57.41 # 7.591& 0.000 15
16 0.000 0.363& 1.260& 0.000 0.000 0.000 389.5 "1579 " 690.7 " 51.52 $ 7.733& 0.000 16
17 0.000 0.074& 0.699& 0.000 0.000 0.000 358.9 "3528 " 552.2 " 46.73 $ 10.28 & 0.000 17
18 0.000 0.005& 0.255& 0.000 0.000 0.000 334.0 "2531 " 510.0 " 42.48 $ 12.88 & 0.000 18
19 0.000 0.000 0.039& 0.000 0.000 4.227& 476.0 "1879 " 481.6 " 38.91 $ 10.71 & 0.000 19
20 0.000 0.000 0.007& 0.000 0.000 12.52 &1426 "1821 " 407.0 " 35.59 $ 7.513& 0.000 20
21 0.000 0.000 0.000 0.000 0.000 16.82 &3034 "2062 " 401.1 " 32.22 $ 19.09 & 0.000 21
22 0.000 0.000 0.000 0.000 0.000 32.28 $5082 "1849 " 432.0 " 29.71 & 16.41 & 0.000 22
23 0.000 0.000 0.000 0.000 0.000 42.91 $5137 "1722 " 441.9 " 25.10 & 12.04 & 0.000 23
24 0.000 0.000 0.000 0.000 0.000 57.31 $3168 "1358 " 536.7 " 23.16 & 9.169& 0.000 24
25 0.000 0.000 0.000 0.000 0.000 136.8 #2360 "1099 " 535.0 " 23.13 & 7.232& 0.000 25
26 0.000 0.000 0.000 0.000 0.000 268.6 "1979 " 957.6 " 405.8 " 33.44 & 3.323& 0.000 26
27 0.000 0.000 0.000 0.000 0.000 189.5 "1477 " 815.5 " 328.8 " 34.22 $ 2.090& 0.000 27
28 245.5 & 0.000 0.000 0.000 0.000 203.8 "1222 " 733.4 " 281.6 " 38.70 $ 3.842& 0.000 28
29 1345 " 0.000 0.000 0.000 255.3 " 995.9 " 814.0 " 252.9 " 36.48 $ 6.837& 0.000 29
30 1166 " 0.000 0.000 0.000 550.9 " 855.7 " 787.5 " 246.1 " 40.45 $ 5.890& 0.000 30
31 548.9 " 0.000 0.000 766.8 " 691.9 " 36.45 $ 0.000 31
Mean 106.6 & 27.25 & 10.00 & 0.000 0.000 59.03 &1210 "1062 " 508.8 " 82.97 & 14.63 & 0.276&
Median 0.000& 0.407& 0.255& 0.000 0.000 0.000& 666.4 " 733.4 " 479.2 " 51.52 & 12.46 & 0.000&
Maximum 1345 & 312.1 & 103.7 & 0.000 0.000 550.9 &5137 "3528 " 996.7 " 245.1 & 34.49 & 4.967&
Minimum 0.000& 0.000& 0.000& 0.000 0.000 0.000& 297.8 " 483.8 " 246.1 " 23.13 & 2.090& 0.000&
Total 3306 & 762.9 & 310.0 & 0.00 0.00 1771 &37502 "32907 "15265 " 2572 & 438.8 & 8.57&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 259.8 & " ... Relative Uncertainty +/-10%
Ann. Median 5.890& # ... Relative Uncertainty +/-15%
Annual Total 94842 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 5137 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2010
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 90.08 # 1.780& 41.75 $ 44.87 $ 71.90 # 32.36 & 4.230& 0.000 0.000 1
2 0.000 0.000 0.000 67.00 # 1.412& 40.26 $ 39.28 $ 78.47 # 30.33 & 3.750& 0.000 0.000 2
3 0.000 0.000 0.000 53.08 $ 1.312& 39.42 $ 35.65 $ 83.14 # 29.00 & 3.422& 0.000 0.000 3
4 0.000 0.000 0.000 41.66 $ 1.027& 36.48 $ 32.21 $ 74.38 # 27.36 & 3.253& 0.000 0.000 4
5 0.000 0.000 0.000 34.19 $ 1.085& 32.83 & 29.85 & 63.36 # 27.09 & 3.217& 0.000 0.000 5
6 0.000 0.000 0.000 28.93 & 1.170& 29.37 & 28.81 & 56.56 # 26.61 & 1.793& 0.000 0.000 6
7 0.000 0.000 0.000 22.82 & 1.046& 25.77 & 27.64 & 49.58 $ 25.23 & 2.210& 0.000 0.000 7
8 0.000 0.000 0.000 18.61 & 1.045& 21.00 & 29.16 & 44.61 $ 24.30 & 2.898& 0.000 0.000 8
9 0.000 0.000 0.000 14.87 & 1.146& 18.67 & 53.51 $ 41.85 $ 25.10 & 2.726& 0.000 0.000 9
10 0.000 0.000 0.000 12.27 & 0.683& 16.75 & 69.80 $ 38.91 $ 25.23 & 2.017& 0.000 0.000 10
11 0.000 0.000 0.000 10.90 & 0.444& 15.74 & 138.1 " 37.50 $ 24.50 & 1.067& 0.000 0.000 11
12 0.000 0.000 0.000 9.177& 0.424& 14.62 & 153.6 " 60.01 $ 21.77 & 1.178& 0.000 0.000 12
13 0.000 0.000 0.000 8.322& 11.65 & 14.01 & 393.1 " 91.99 # 22.52 & 1.924& 0.000 0.000 13
14 0.000 0.000 0.000 7.815& 4.944& 14.76 & 411.0 " 137.5 " 28.77 & 0.608& 0.000 0.000 14
15 0.000 0.000 0.000 6.874& 3.947& 26.96 & 582.8 " 111.8 " 30.74 & 0.231& 0.000 0.000 15
16 0.000 0.000 0.000 6.090& 9.178& 20.95 & 494.6 " 178.1 " 26.33 & 0.224& 0.000 0.000 16
17 0.000 0.000 0.000 5.954& 7.945& 23.05 & 319.2 " 193.8 " 20.71 & 0.238& 0.000 0.000 17
18 0.000 0.000 0.000 6.841& 8.181& 41.90 $ 230.3 " 139.7 " 17.26 & 0.138& 0.000 0.000 18
19 0.000 0.000 0.000 6.303& 12.50 & 58.51 $ 185.8 " 105.7 " 15.07 & 0.090& 0.000 0.000 19
20 0.000 0.000 0.000 3.983& 15.20 & 93.37 # 164.5 " 85.15 # 13.05 & 0.034& 0.000 0.000 20
21 0.000 0.000 0.000 3.853& 29.39 & 86.54 # 146.2 " 72.17 # 11.67 & 0.003& 0.000 0.000 21
22 0.000 0.000 0.000 3.424& 36.69 $ 68.86 # 126.0 " 65.40 # 10.61 & 0.000& 0.000 0.000 22
23 0.000 0.000 0.000 2.757& 16.57 & 63.35 $ 107.0 " 58.60 # 9.631& 0.000 0.000 0.000 23
24 0.000 0.000 0.000 2.954& 15.21 & 53.10 $ 93.07 " 54.20 $ 8.435& 0.000 0.000 0.000 24
25 0.000 0.000 156.7 & 3.620& 17.00 & 54.13 $ 82.68 # 49.70 $ 8.103& 0.000 0.000 0.000 25
26 0.000 0.000 798.4 " 2.321& 19.82 & 53.86 $ 74.29 # 45.13 $ 7.902& 0.000 0.000 0.000 26
27 0.000 0.000 521.5 " 2.350& 68.44 & 53.65 $ 67.74 # 42.30 $ 7.676& 0.000 0.000 0.000 27
28 0.000 0.000 480.0 " 2.575& 72.00 # 53.63 $ 63.83 # 40.13 $ 6.627& 0.000 0.000 0.000 28
29 0.000 357.7 " 2.718& 53.77 $ 53.94 $ 67.04 # 36.32 $ 6.260& 0.000 0.000 0.000 29
30 0.000 222.1 " 2.058& 48.41 $ 50.71 $ 75.37 # 32.51 $ 4.754& 0.000 0.000 0.000 30
31 0.000 140.5 " 45.04 $ 79.61 # 35.66 $ 0.000 0.000 31
Mean 0.000 0.000 86.35 & 16.15 & 16.40 & 40.60 & 143.4 & 73.42 $ 19.17 & 1.137& 0.000 0.000
Median 0.000 0.000 0.000& 6.857& 8.181& 39.84 & 79.61 & 60.01 $ 22.14 & 0.231& 0.000 0.000
Maximum 0.000 0.000 798.4 & 90.08 & 72.00 & 93.37 & 582.8 & 193.8 $ 32.36 & 4.230& 0.000 0.000
Minimum 0.000 0.000 0.000& 2.058& 0.424& 14.01 & 27.64 & 32.51 $ 4.754& 0.000& 0.000 0.000
Total 0.000 0.000 2677 & 484.4 & 508.5 &1218 &4446 &2276 $ 575.0 & 35.25 & 0.000 0.000
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 33.48 & " ... Relative Uncertainty +/-10%
Ann. Median 2.350& # ... Relative Uncertainty +/-15%
Annual Total 12220 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 798.4 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2011
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 0.000 151.4 "2067 " 261.9 " 136.9 " 160.6 " 0.639& 1
2 0.000 0.000 0.000 0.000 0.000 0.000 303.4 "3224 " 269.3 " 132.5 " 122.2 " 0.314& 2
3 0.000 0.000 0.000 0.000 0.000 0.000 354.2 "2904 " 378.1 " 115.5 " 98.94 " 0.097& 3
4 0.000 0.000 0.000 0.000 0.000 0.000 364.2 "2389 " 352.6 " 108.9 " 139.2 " 0.020& 4
5 0.000 0.000 0.000 0.000 0.000 0.000 278.3 "2260 " 407.3 " 221.5 " 401.5 " 0.002& 5
6 0.000 0.000 0.000 0.000 0.000 0.000 189.9 "1658 " 453.8 " 400.9 " 389.5 " 6.563& 6
7 0.000 0.000 0.000 0.000 0.000 0.000 145.2 "1210 " 337.4 " 242.5 " 332.1 " 16.08 & 7
8 0.000 0.000 0.000 0.000 0.000 0.000 113.4 " 948.1 " 265.9 " 161.4 " 229.2 " 12.55 & 8
9 0.000 0.000 0.000 0.000 0.000 0.438& 91.85 # 782.5 " 220.2 " 124.7 " 189.0 " 21.13 & 9
10 0.000 0.000 0.000 0.000 0.000 14.94 & 78.68 # 679.5 " 187.2 " 121.1 " 174.6 " 28.44 & 10
11 0.000 0.000 0.000 0.000 0.000 15.33 & 104.4 # 590.1 " 160.9 " 149.7 " 149.8 " 46.15 $ 11
12 0.000 0.000 0.000 0.000# 0.000 12.86 & 184.3 " 530.4 " 137.4 " 179.0 " 137.5 " 83.79 # 12
13 0.000 0.000 0.000 0.000# 0.000 10.46 & 308.1 " 473.8 " 122.6 " 126.9 " 122.2 " 59.00 $ 13
14 0.000 0.000 0.000 0.000# 0.000 11.36 & 290.2 " 444.5 " 110.1 " 92.57 # 115.3 " 38.42 $ 14
15 0.000 0.000 0.000 0.000# 0.000 10.36 & 321.0 " 457.2 " 101.6 " 78.73 # 109.4 " 50.58 & 15
16 0.000 0.000 0.000 0.000# 0.000 8.954& 501.6 " 562.6 " 95.56 " 64.72 # 104.0 " 156.5 " 16
17 0.000 0.000 0.000 0.000# 0.000 8.582& 661.7 " 807.6 " 101.3 " 54.11 $ 99.18 " 158.7 " 17
18 0.000 0.000 0.000 0.000# 0.000 7.895& 547.8 " 735.9 " 151.5 " 53.69 $ 93.96 # 150.4 " 18
19 0.000 0.000 0.000 0.000# 0.000 6.784& 441.9 " 723.7 " 294.2 " 47.34 $ 86.70 # 121.3 " 19
20 0.000 0.000 0.000 0.000 0.000 7.131& 404.3 " 535.5 " 290.3 " 45.30 $ 74.93 # 105.7 " 20
21 0.000 0.000 0.000 0.000 0.000 7.917& 337.3 " 418.8 " 313.8 " 42.17 $ 57.21 # 84.35 # 21
22 0.000 0.000 0.000 0.000 0.000 7.687& 384.8 " 390.2 " 338.3 " 40.69 $ 42.11 $ 66.99 # 22
23 0.000 0.000 0.000 0.000 0.000 7.589& 365.3 " 525.3 " 300.1 " 38.56 $ 28.06 & 51.50 $ 23
24 0.000 0.000 0.000 0.000 0.000 9.548& 332.5 " 876.9 " 248.9 " 37.75 $ 18.80 & 38.73 $ 24
25 0.000 0.000 0.000 0.000 0.000 13.50 & 312.6 "1405 " 220.5 " 58.22 $ 15.42 & 28.19 & 25
26 0.000 0.000 0.000 0.000 0.000 14.51 & 294.3 " 807.2 " 215.6 " 132.6 # 8.931& 20.35 & 26
27 0.000 0.000 0.000 0.000 0.000 17.48 & 295.1 " 561.5 " 179.5 " 175.9 " 5.923& 16.69 & 27
28 0.000 0.000 0.000 0.000 0.000 42.26 & 278.5 " 449.2 " 170.8 " 203.7 " 5.544& 13.81 & 28
29 0.000 0.000 0.000 0.000 54.62 $ 623.9 " 369.9 " 163.5 " 197.8 " 2.800& 12.25 & 29
30 0.000 0.000 0.000 0.000 159.3 #1002 " 319.5 " 148.6 " 232.0 " 1.171& 10.66 & 30
31 0.000 0.000 0.000 1503 " 284.8 " 208.9 " 8.791& 31
Mean 0.000 0.000 0.000 0.000# 0.000 14.98 & 373.1 # 980.4 " 233.3 " 129.9 $ 117.2 & 45.45 &
Median 0.000 0.000 0.000 0.000# 0.000 8.250& 312.6 # 679.5 " 220.4 " 124.7 $ 101.6 & 28.19 &
Maximum 0.000 0.000 0.000 0.000# 0.000 159.3 &1503 #3224 " 453.8 " 400.9 $ 401.5 & 158.7 &
Minimum 0.000 0.000 0.000 0.000# 0.000 0.000& 78.68 # 284.8 " 95.56 " 37.75 $ 1.171& 0.002&
Total 0.00 0.00 0.00 0.00# 0.00 449.5 &11565 #30391 " 6999 " 4026 $ 3516 & 1409 &
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 159.9 & " ... Relative Uncertainty +/-10%
Ann. Median 10.46 & # ... Relative Uncertainty +/-15%
Annual Total 58356 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 3224 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2012
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 9.548& 2.888& 0.000 0.000 0.000 0.000 101.8 " 35.52 $ 41.57 $ 47.52 $ 0.115& 0.026& 1
2 48.98 & 1.349& 0.000 0.000 0.000 0.000 90.33 " 33.76 $ 38.04 $ 51.70 $ 0.276& 0.008& 2
3 43.86 & 21.70 & 0.000 0.000 0.000 0.000 85.67 # 45.66 $ 38.86 & 59.01 $ 0.193& 0.001& 3
4 129.8 " 1.588& 0.000 0.000 0.000 0.000 79.41 # 52.41 $ 55.94 $ 51.16 $ 1.336& 0.000& 4
5 63.77 $ 0.703& 0.000 0.000 0.000 0.000 71.64 # 64.98 # 184.2 # 40.64 $ 5.196& 0.000& 5
6 35.41 & 0.840& 0.000 0.000 0.000 0.000 63.52 # 66.68 # 195.7 " 31.47 & 1.606& 0.000 6
7 26.06 & 1.308& 0.000 0.000 0.000 0.000 59.87 # 71.32 # 238.8 " 23.99 & 1.331& 0.000 7
8 19.39 & 0.730& 0.000 0.000 0.000 0.000 54.33 $ 79.10 # 394.4 " 19.73 & 1.053& 0.000 8
9 16.46 & 0.332& 0.000 0.000 0.000 8.787& 50.38 $ 83.67 # 307.8 " 16.65 & 0.938& 0.000 9
10 14.09 & 0.271& 0.000 0.000 0.000 72.67 $ 54.45 $ 78.12 # 214.2 " 13.43 & 0.646& 0.000 10
11 11.90 & 0.131& 0.000 0.000 0.000 42.04 $ 54.49 $ 101.4 # 158.7 " 11.34 & 0.130& 0.000 11
12 10.56 & 0.012& 0.000 0.000 0.000 57.66 $ 67.40 # 116.7 " 120.4 " 9.864& 0.008& 0.396& 12
13 7.703& 0.000 0.000 0.000 0.000 102.8 # 62.04 # 99.95 " 96.50 # 8.502& 0.000& 2.976& 13
14 6.275& 0.000 0.000 0.000 0.000 212.4 " 55.23 # 146.8 " 79.53 # 7.369& 0.000 3.542& 14
15 6.296& 0.000 0.000 0.000 0.000 182.7 " 55.53 # 185.5 " 66.40 # 6.238& 0.015& 1.799& 15
16 2.531& 0.000 0.000 0.000 0.000 223.5 " 53.12 $ 176.3 " 56.69 $ 5.659& 1.087& 1.508& 16
17 0.781& 0.000 0.000 0.000 0.000 220.6 " 50.68 $ 182.7 " 46.25 $ 5.665& 4.499& 0.993& 17
18 0.321& 0.000 0.000 0.000 0.000 191.5 " 50.54 $ 147.9 " 43.07 $ 4.479& 6.634& 0.322& 18
19 0.150& 0.000 0.000 0.000 0.000 163.5 " 53.33 $ 117.8 " 36.99 $ 3.711& 3.956& 0.017& 19
20 0.068& 0.000 0.000 0.000 0.000 301.3 " 47.74 $ 99.52 " 32.65 & 3.205& 1.223& 0.000 20
21 59.99 & 0.000 0.000 0.000 0.000 289.0 " 46.20 $ 84.35 # 30.54 & 3.457& 0.443& 0.000 21
22 22.13 & 0.000 0.000 0.000 0.000 217.5 " 45.10 $ 74.21 # 25.98 & 2.644& 10.46 & 0.000 22
23 6.638& 0.000 0.000 0.000 0.000 213.9 " 43.06 $ 76.74 # 25.06 & 2.124& 40.84 & 0.000 23
24 2.086& 0.000 0.000 0.000 0.000 238.8 " 40.86 $ 69.44 # 23.26 & 1.240& 42.72 & 0.000 24
25 0.672& 0.000 0.000 0.000 0.000 203.4 " 38.48 $ 64.97 # 23.19 & 1.308& 10.51 & 0.000 25
26 0.100& 0.000 0.000 0.000 0.000 178.2 " 37.73 $ 59.41 # 23.13 & 1.218& 5.785& 0.000 26
27 7.664& 0.000 0.000 0.000 0.000 160.3 " 35.94 $ 55.15 # 30.03 & 1.175& 3.175& 0.000 27
28 19.83 & 0.000 0.000 0.000 0.000 141.3 " 33.92 $ 56.50 $ 47.28 $ 1.212& 2.518& 0.000 28
29 9.767& 0.000 0.000 0.000 0.000 127.8 " 31.47 & 51.49 $ 56.14 # 1.045& 2.227& 0.000 29
30 5.377& 0.000 0.000 0.000 115.6 " 29.60 & 49.79 $ 50.46 $ 0.672& 0.326& 0.000 30
31 4.286& 0.000 0.000 37.03 & 45.62 $ 0.181& 0.000 31
Mean 19.11 & 1.098& 0.000 0.000 0.000 122.2 & 54.22 & 86.24 $ 92.73 & 14.12 & 4.975& 0.374&
Median 9.548& 0.000& 0.000 0.000 0.000 134.5 & 53.12 & 74.21 $ 48.87 & 5.665& 1.277& 0.000&
Maximum 129.8 & 21.70 & 0.000 0.000 0.000 301.3 & 101.8 & 185.5 $ 394.4 & 59.01 & 42.72 & 3.542&
Minimum 0.068& 0.000& 0.000 0.000 0.000 0.000& 29.60 & 33.76 $ 23.13 & 0.181& 0.000& 0.000&
Total 592.5 & 31.85 & 0.000 0.000 0.000 3665 &1681 &2674 $2782 & 437.6 & 149.3 & 11.59 &
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 32.85 & " ... Relative Uncertainty +/-10%
Ann. Median 1.343& # ... Relative Uncertainty +/-15%
Annual Total 12024 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 394.4 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2013
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 2.291& 0.184& 37.29 & 15.35 & 497.6 " 443.7 " 298.4 " 18.68 & 0.000 1
2 0.000 0.000 0.000 11.93 & 0.343& 39.87 $ 13.76 & 446.9 " 355.6 " 255.0 " 15.32 & 0.000 2
3 0.000 0.000 0.000 17.77 & 0.270& 27.87 & 13.30 & 381.4 " 360.0 " 246.0 " 12.59 & 0.000 3
4 0.000 0.000 0.000 32.90 $ 0.206& 35.35 $ 12.59 & 301.9 " 324.8 " 257.7 " 11.50 & 0.000 4
5 0.000 0.000 0.000 27.65 & 0.130& 31.32 & 13.33 & 247.9 " 301.0 " 214.0 " 9.364& 0.000 5
6 0.000 0.000 0.000 18.99 & 0.106& 23.17 & 14.57 & 219.2 " 241.8 " 169.7 " 8.478& 0.000 6
7 0.000 0.000 0.000 13.85 & 0.067& 27.57 & 15.26 & 252.4 " 278.0 " 145.6 " 8.027& 0.000 7
8 17.04 & 0.000 0.000 13.60 & 4.747& 24.29 & 13.21 & 409.4 " 485.6 " 123.9 " 7.241& 0.000 8
9 14.83 & 0.000 0.000 10.31 & 12.11 & 21.85 & 13.57 & 837.9 " 405.3 " 125.4 " 6.580& 0.000 9
10 4.563& 0.000 0.000 9.202& 7.916& 19.65 & 15.78 &1176 " 431.8 " 135.8 " 5.077& 0.000 10
11 1.415& 0.000 0.000 7.007& 10.03 & 18.47 & 15.23 &1522 " 561.4 " 147.3 " 4.339& 0.000 11
12 0.423& 0.000 0.000 4.983& 13.47 & 18.53 & 25.19 &1150 " 726.1 " 123.5 " 3.492& 0.000 12
13 0.107& 0.000 0.000 5.889& 19.20 & 19.99 & 60.74 & 987.8 " 681.3 " 125.4 " 1.958& 0.000 13
14 3.203& 0.000 0.000 6.776& 41.05 $ 18.35 & 157.9 " 860.6 " 893.5 " 106.7 " 0.851& 0.000 14
15 1.751& 0.000 0.000 5.463& 34.96 $ 17.93 & 140.1 " 664.1 "1080 " 91.06 # 0.282& 0.000 15
16 0.460& 0.000 0.000 4.109& 32.58 & 19.33 & 257.7 " 540.8 "1006 " 77.85 # 0.103& 0.000 16
17 0.037& 0.000 0.000 4.511& 26.75 & 22.10 & 318.0 " 481.7 "1680 " 66.73 # 0.063& 0.000 17
18 0.000& 0.000 0.000 4.599& 22.47 & 21.18 & 486.6 " 414.0 "1242 " 58.90 $ 0.017& 0.000 18
19 0.000 0.000 0.000 5.211& 20.56 & 24.47 & 464.8 " 392.0 "1045 " 52.81 $ 0.000& 0.000 19
20 0.000 0.000 0.000 3.203& 25.45 & 20.47 & 448.5 " 362.6 "1096 " 53.61 $ 0.000 0.000 20
21 0.000 0.000 0.000 1.422& 19.00 & 25.82 & 363.6 " 302.3 " 813.5 " 49.62 $ 0.000 0.000 21
22 0.000 0.000 0.000 1.536& 18.21 & 24.79 & 298.6 " 260.1 " 651.4 " 48.58 $ 0.000 0.000 22
23 0.000 0.000 0.000 1.384& 18.48 & 20.52 & 271.7 " 223.0 " 729.5 " 41.57 $ 0.000 0.000 23
24 0.000 0.000 0.000 1.169& 21.11 & 18.37 & 224.2 " 193.1 " 793.1 " 37.46 & 0.000 0.000 24
25 0.000 0.000 0.000 1.135& 19.46 & 15.40 & 170.3 " 171.3 " 928.0 " 33.51 $ 0.000 0.000 25
26 0.000 0.000 0.000 1.240& 18.36 & 13.58 & 161.5 " 160.1 "1206 " 33.62 & 0.000 0.000 26
27 0.000 0.000 0.000 0.769& 16.42 & 14.80 & 228.7 " 165.7 " 829.3 " 32.57 & 0.000 0.000 27
28 0.000 0.000 0.000 0.514& 14.53 & 17.37 & 452.3 " 184.8 " 574.3 " 30.93 & 0.000 0.000 28
29 0.000 0.000 0.270& 16.58 & 18.03 & 474.1 " 205.7 " 430.8 " 28.65 & 0.000 0.000 29
30 0.000 0.000 0.217& 18.32 & 17.58 & 822.1 " 205.2 " 352.7 " 25.60 & 0.000 0.000 30
31 0.000 0.000 15.27 & 660.8 " 306.3 " 22.09 & 0.000 31
Mean 1.414& 0.000 0.000 7.331& 15.11 & 22.51 & 214.3 & 468.5 " 698.3 " 105.1 & 3.798& 0.000
Median 0.000& 0.000 0.000 4.791& 16.58 & 20.49 & 161.5 & 362.6 " 666.3 " 77.85 & 0.192& 0.000
Maximum 17.04 & 0.000 0.000 32.90 & 41.05 & 39.87 & 822.1 &1522 "1680 " 298.4 & 18.68 & 0.000
Minimum 0.000& 0.000 0.000 0.217& 0.067& 13.58 & 12.59 & 160.1 " 241.8 " 22.09 & 0.000& 0.000
Total 43.83& 0.00 0.00 219.9 & 468.3 & 675.3 & 6643 &14523 "20948 " 3259 & 114.0 & 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 128.5 & " ... Relative Uncertainty +/-10%
Ann. Median 12.59 & # ... Relative Uncertainty +/-15%
Annual Total 46895 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 1680 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2014
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 5.639& 208.5 " 81.20 # 469.4 " 597.7 " 95.98 # 26.03 & 0.000" 1
2 0.000 0.000 0.000 0.000 17.94 & 185.0 " 91.97 # 410.6 " 889.1 " 92.31 # 21.21 & 0.000" 2
3 0.000 0.000 0.000 0.000 14.31 & 165.5 " 161.3 " 346.2 " 669.9 " 88.77 # 15.34 & 0.000" 3
4 0.000 0.000 0.000 0.000 11.18 & 125.1 " 191.6 " 293.3 " 502.9 " 80.61 # 13.09 & 0.000" 4
5 0.000 0.000 0.000 0.000 10.09 & 94.25 # 151.0 " 253.2 " 419.4 " 70.64 $ 11.82 & 0.000" 5
6 0.000 0.000 0.000 0.000 8.812& 77.86 # 191.2 " 223.5 " 348.3 " 60.22 # 9.697& 0.000" 6
7 0.000 0.000 0.000 0.000 15.80 & 64.90 # 249.0 " 201.2 " 294.8 " 52.06 $ 8.321& 0.000" 7
8 0.000 0.000 0.000 0.000 25.02 & 56.29 $ 388.6 " 188.1 " 311.0 " 48.24 $ 6.695& 0.000" 8
9 0.000 0.000 0.000 0.000 47.27 & 50.06 $ 502.0 " 192.2 " 418.8 " 43.66 $ 5.318& 0.000" 9
10 0.000 0.000 0.000 0.000 104.1 # 48.50 $ 631.6 " 188.0 " 391.4 " 42.00 $ 5.360& 0.000" 10
11 0.000 0.000 0.000 0.000 37.34 & 43.53 $ 622.9 " 211.2 " 468.0 " 39.67 $ 4.198& 0.000" 11
12 0.000 0.000 0.000 0.000 19.14 & 54.36 $ 464.3 " 233.4 " 540.3 " 39.65 $ 2.824& 0.000" 12
13 0.000 0.000 0.000 0.000 12.75 & 57.08 $ 348.7 " 200.1 " 426.7 " 35.66 $ 1.721& 0.000" 13
14 0.000 0.000 0.000 0.000 9.718& 45.03 $ 317.1 " 168.5 " 309.6 " 30.62 & 0.907& 0.000" 14
15 0.000 0.000 0.000 0.000 7.440& 43.17 $ 406.8 " 144.2 " 248.0 " 26.81 & 0.697& 0.000" 15
16 0.000 0.000 0.000 0.000 6.208& 40.26 $ 382.5 " 127.3 " 210.2 " 21.91 & 0.681& 0.000" 16
17 0.000 0.000 0.000 0.000 5.582& 46.26 & 373.2 " 116.4 " 180.5 " 18.37 & 0.394& 0.000" 17
18 0.000 0.000 0.000 0.000 10.83 & 70.01 $ 383.7 " 132.1 " 155.8 " 18.03 & 0.151& 0.000" 18
19 0.000 0.000 0.000 0.000 11.39 & 175.0 # 318.5 " 219.9 " 126.0 " 87.13 & 0.049& 0.000" 19
20 0.000 0.000 0.000 0.000 10.27 & 212.3 " 281.8 " 292.6 " 100.0 # 87.30 $ 0.007& 0.000" 20
21 0.000 0.000 0.000 0.000 10.14 & 183.9 " 347.3 " 262.9 " 96.88 # 92.20 # 0.001& 0.000" 21
22 0.000 0.000 0.000 0.000 9.015& 270.0 " 517.4 " 291.0 " 91.31 # 66.70 $ 0.000" 0.000" 22
23 0.000 0.000 0.000 0.000 33.45 & 302.6 " 889.3 " 299.4 " 113.7 " 43.92 $ 0.000" 0.000" 23
24 0.000 0.000 0.000 0.000 49.02 & 226.9 " 799.8 " 243.8 " 130.3 " 43.96 $ 0.000" 0.000" 24
25 0.000 0.000 0.000 0.000 182.8 " 197.9 " 803.9 " 214.3 " 137.2 " 39.62 & 0.000" 0.000" 25
26 0.000 0.000 0.000 0.000 104.6 " 199.9 " 662.0 " 204.3 " 178.7 " 31.67 & 0.000" 0.000" 26
27 0.000 0.000 0.000 0.000 156.5 " 166.2 " 601.2 " 181.6 " 161.9 " 40.85 & 0.000" 0.000" 27
28 0.000 0.000 0.000 0.000 236.0 " 130.4 " 575.4 " 154.6 " 122.6 " 54.57 $ 0.000" 0.000" 28
29 0.000 0.000 0.000 265.4 " 105.9 " 639.3 " 135.4 " 105.3 " 47.77 $ 0.000" 0.000" 29
30 0.000 0.000 0.000 253.8 " 90.70 # 713.0 " 263.7 " 94.86 # 38.40 & 0.000" 0.000" 30
31 0.000 0.000 228.0 " 559.8 " 475.9 " 30.58 & 0.000" 31
Mean 0.000 0.000 0.000 0.000 61.92 & 124.6 & 440.2 # 236.7 " 294.7 # 51.93 & 4.484& 0.000"
Median 0.000 0.000 0.000 0.000 15.80 & 100.1 & 388.6 # 214.3 " 229.1 # 43.92 & 0.689& 0.000"
Maximum 0.000 0.000 0.000 0.000 265.4 & 302.6 & 889.3 # 475.9 " 889.1 # 95.98 & 26.03 & 0.000"
Minimum 0.000 0.000 0.000 0.000 5.582& 40.26 & 81.20 # 116.4 " 91.31 # 18.03 & 0.000& 0.000"
Total 0.00 0.00 0.00 0.00 1920 & 3737 &13647 # 7338 " 8841 # 1610 & 134.5 & 0.00"
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 102.0 & " ... Relative Uncertainty +/-10%
Ann. Median 9.718& # ... Relative Uncertainty +/-15%
Annual Total 37228 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 889.3 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2015
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 25.23 & 248.0 " 109.2 " 8.859& 0.072& 0.000 1
2 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 24.28 & 767.8 " 98.96 # 8.054& 0.144& 0.000 2
3 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 20.75 & 758.1 " 92.71 # 7.303& 0.050& 0.000 3
4 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 15.90 & 864.9 " 92.21 # 6.562& 0.006& 0.000 4
5 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 13.67 & 662.9 " 87.31 # 4.971& 0.001& 0.000 5
6 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 13.48 & 562.7 " 79.23 # 4.264& 0.081& 0.000 6
7 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 15.11 & 481.2 " 79.13 # 4.960& 0.577& 0.000 7
8 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 14.59 & 402.7 " 70.47 # 5.221& 0.432& 0.000 8
9 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 13.84 & 345.8 " 61.87 $ 5.138& 0.246& 0.000 9
10 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 15.42 & 332.4 " 62.07 $ 3.520& 0.079& 0.000 10
11 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 17.00 & 357.4 " 59.75 $ 3.521& 0.020& 0.000 11
12 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 17.86 & 406.6 " 55.85 $ 3.007& 0.000& 0.000 12
13 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 20.46 & 335.5 " 53.16 $ 2.534& 0.000 0.000 13
14 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 22.74 & 281.5 " 62.26 # 2.133& 0.000& 0.000 14
15 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 23.58 & 269.9 " 57.11 $ 1.764& 0.000 0.000 15
16 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 20.88 & 259.0 " 55.59 $ 1.562& 0.000 0.000 16
17 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 17.79 & 258.3 " 66.08 # 1.750& 0.000 0.000 17
18 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 16.18 & 252.9 " 66.76 # 1.328& 0.000 0.000 18
19 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 14.43 & 288.0 " 52.44 $ 1.221& 0.000 0.000 19
20 0.000" 0.000" 0.000" 0.000" 0.000" 0.000 17.82 & 311.3 " 43.86 $ 0.893& 0.000 0.000 20
21 0.000" 0.000" 0.000" 0.000" 0.000 0.000 14.63 & 402.1 " 36.84 & 1.077& 0.000 0.000 21
22 0.000" 0.000" 0.000" 0.000" 0.000 0.000 13.79 & 465.1 " 31.33 & 1.572& 0.000 0.000 22
23 0.000" 0.000" 0.000" 0.000" 0.000 0.000 18.44 & 482.2 " 26.59 & 1.443& 0.000 0.000 23
24 0.000" 0.000" 0.000" 0.000" 0.000 0.000 19.20 & 455.8 " 22.48 & 0.840& 0.000 0.000 24
25 0.000" 0.000" 0.000" 0.000" 0.000 31.78 & 62.12 & 440.7 " 18.91 & 0.496& 0.000 0.000 25
26 0.000" 0.000" 0.000" 0.000" 0.000 96.24 " 78.61 # 342.2 " 16.05 & 0.063& 0.000 0.000 26
27 0.000" 0.000" 0.000" 0.000" 0.000 74.72 # 61.88 # 237.2 " 13.91 & 0.089& 0.000 0.000 27
28 0.000" 0.000" 0.000" 0.000" 0.000 55.09 $ 80.51 $ 183.3 " 12.24 & 0.636& 0.000 0.000 28
29 0.000" 0.000" 0.000" 0.000 40.59 $ 54.80 $ 161.8 " 10.85 & 0.788& 0.000 0.000 29
30 0.000" 0.000" 0.000" 0.000 29.97 & 53.04 $ 141.1 " 9.873& 0.566& 0.000 0.000 30
31 0.000" 0.000" 0.000 127.4 " 123.5 " 0.308& 0.000 31
Mean 0.000" 0.000" 0.000" 0.000" 0.000" 10.95 & 30.50 & 383.3 " 53.50 & 2.789& 0.057& 0.000
Median 0.000" 0.000" 0.000" 0.000" 0.000" 0.000& 18.44 & 342.2 " 56.48 & 1.750& 0.000& 0.000
Maximum 0.000" 0.000" 0.000" 0.000" 0.000" 96.24 & 127.4 & 864.9 " 109.2 & 8.859& 0.577& 0.000
Minimum 0.000" 0.000" 0.000" 0.000" 0.000" 0.000& 13.48 & 123.5 " 9.873& 0.063& 0.000& 0.000
Total 0.00" 0.00" 0.00" 0.00" 0.00" 328.4 & 945.4 &11882 " 1605 & 86.45& 1.71& 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 40.68 & " ... Relative Uncertainty +/-10%
Ann. Median 0.000& # ... Relative Uncertainty +/-15%
Annual Total 14849 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 864.9 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2016
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 255.9 " 0.000 18.54 & 93.67 " 346.8 " 132.6 " 485.9 " 686.9 " 118.4 " 9.434& 0.000 1
2 0.000 185.2 " 0.000 15.73 & 83.54 # 328.4 " 142.2 " 450.5 " 566.6 " 129.1 " 9.410& 0.000 2
3 0.000 138.2 " 0.000 12.66 & 80.28 # 306.2 " 220.6 " 437.4 " 498.9 " 155.9 " 8.426& 0.000 3
4 0.000 103.8 # 0.000 10.67 & 96.40 " 286.7 " 200.2 " 441.0 " 485.4 " 137.1 " 7.219& 0.000 4
5 0.000 83.93 # 0.000 9.468& 103.7 " 293.1 " 164.8 " 458.2 " 443.2 " 118.3 " 7.679& 0.000 5
6 0.000 64.64 $ 0.000 9.275& 169.6 " 376.0 " 143.7 " 480.1 " 386.9 " 110.4 " 6.221& 0.000 6
7 0.000 47.98 $ 0.000 8.388& 253.5 " 427.0 " 133.8 " 574.1 " 350.6 " 114.9 " 4.640& 0.000 7
8 0.000 37.03 & 0.000 9.006& 278.9 " 476.0 " 135.4 " 815.6 " 355.1 " 115.6 " 5.286& 0.000 8
9 0.000 28.31 & 0.000 10.22 & 305.3 " 475.6 " 231.6 " 896.1 " 359.5 " 127.5 " 3.905& 0.000 9
10 0.000 20.80 & 0.000 9.617& 291.2 " 452.2 " 606.5 " 828.4 " 303.7 " 125.3 " 4.645& 0.000 10
11 0.000 14.63 & 0.000 19.08 & 290.5 " 455.2 " 600.9 " 942.5 " 320.5 " 111.6 " 4.317& 0.000 11
12 0.000& 10.53 & 0.000 22.30 & 289.0 " 450.5 " 482.9 " 777.6 " 360.3 " 95.74 # 3.595& 0.000 12
13 0.013& 6.630& 0.000 73.27 & 281.8 " 431.3 " 413.2 " 611.8 " 277.9 " 92.30 # 4.033& 0.000 13
14 0.004& 4.694& 0.000 185.9 " 274.2 " 367.5 " 322.2 " 504.6 " 226.9 " 84.39 # 3.834& 0.000 14
15 0.000& 3.222& 0.000 125.4 " 246.5 " 274.8 " 256.5 " 450.8 " 204.1 " 74.86 # 3.266& 0.000 15
16 0.000& 2.439& 0.000 152.7 " 161.8 " 207.2 " 232.4 " 460.2 " 190.6 " 63.90 $ 2.494& 0.000 16
17 0.000 2.742& 0.000 174.8 " 102.0 # 210.7 " 655.1 " 465.1 " 175.2 " 52.43 $ 1.467& 0.000 17
18 0.000 0.850& 0.000 178.9 " 73.13 # 209.5 " 984.8 " 671.2 " 159.1 " 46.38 $ 1.052& 0.000 18
19 0.003& 0.116& 0.000 191.8 " 58.03 # 188.0 " 840.9 " 641.1 " 157.2 " 39.16 & 1.074& 0.341& 19
20 20.08 & 0.004& 0.000 263.4 " 51.79 $ 170.7 " 985.7 " 795.6 " 174.3 " 34.13 & 0.521& 18.37 & 20
21 24.54 & 0.003& 0.000 369.0 " 89.78 $ 164.6 " 993.7 "1042 " 160.6 " 30.21 & 0.105& 16.78 & 21
22 8.493& 0.000& 0.000 318.5 " 315.6 # 169.1 " 991.0 " 795.5 " 158.1 " 25.37 & 0.028& 8.662& 22
23 6.053& 0.000 0.000 285.3 " 374.7 " 156.1 " 908.6 " 675.1 " 189.5 " 21.65 & 0.005& 4.246& 23
24 2.824& 0.000 0.000 246.4 " 352.2 " 147.3 " 846.2 " 579.8 " 205.7 " 19.03 & 0.000& 4.171& 24
25 18.31 & 0.000 0.000 210.7 " 614.5 " 143.4 " 763.3 " 536.4 " 186.2 " 16.71 & 0.000 1.293& 25
26 5.972& 0.000 0.000 156.6 " 601.2 " 136.0 " 648.0 " 492.9 " 160.4 " 15.63 & 0.000 0.913& 26
27 30.77 & 0.000 365.8 & 130.6 " 590.3 " 128.0 " 563.5 " 536.9 " 147.2 " 13.72 & 0.000 0.547& 27
28 34.37 & 0.000 367.3 " 134.8 " 595.7 " 120.0 " 512.7 " 659.1 " 144.2 " 13.00 & 0.000 0.003& 28
29 22.50 & 0.000 182.5 " 117.6 " 512.3 " 119.1 " 481.8 " 599.3 " 145.7 " 11.87 & 0.000 0.000 29
30 70.42 & 64.25 $ 106.4 " 439.3 " 127.1 " 456.5 " 981.3 " 124.9 " 11.34 & 0.000 0.000 30
31 225.6 " 31.50 & 378.9 " 445.2 " 915.0 " 10.32 & 0.000 31
Mean 15.16 & 34.88 & 32.62 & 119.2 & 272.6 $ 271.5 " 499.9 " 645.2 " 276.8 " 68.91 & 3.089& 1.785&
Median 0.000& 3.222& 0.000& 121.5 & 278.9 $ 242.8 " 481.8 " 599.3 " 204.9 " 63.90 & 2.880& 0.000&
Maximum 225.6 & 255.9 & 367.3 & 369.0 & 614.5 $ 476.0 " 993.7 "1042 " 686.9 " 155.9 & 9.434& 18.37 &
Minimum 0.000& 0.000& 0.000& 8.388& 51.79 $ 119.1 " 132.6 " 437.4 " 124.9 " 10.32 & 0.000& 0.000&
Total 469.9 & 1012 & 1011 & 3577 & 8449 $ 8144 "15497 "20001 " 8305 " 2136 & 92.66& 55.33&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 187.8 & " ... Relative Uncertainty +/-10%
Ann. Median 94.71 & # ... Relative Uncertainty +/-15%
Annual Total 68750 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 1042 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2017
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.00 529.6 " 2053 " 75.04# 30.22$ 45.36$ 75.68# 773.3 " 518.3 " 362.4 " 50.87$ 3.48& 1
2 0.00 412.7 " 2041 " 72.54# 28.27& 41.94$ 97.70# 746.1 " 586.7 " 321.5 " 45.18$ 2.19& 2
3 0.00 159.9 " 2050 " 69.38# 27.09& 40.55$ 163.3 " 743.4 " 590.4 " 292.1 " 41.35$ 1.49& 3
4 0.00 76.27# 2070 " 62.57# 27.10& 39.07$ 154.3 " 769.2 " 573.0 " 258.1 " 38.49$ 3.09& 4
5 0.00 54.52$ 2125 " 58.89# 27.80& 37.79$ 173.4 " 602.1 " 521.4 " 223.5 " 33.89$ 4.40& 5
6 0.00 33.95& 1882 " 55.72$ 28.77& 36.54$ 209.3 " 519.3 " 467.3 " 199.8 " 28.70& 2.19& 6
7 0.00 30.41& 1673 " 49.89$ 28.34& 35.37$ 215.6 " 495.2 " 421.8 " 179.4 " 25.60& 0.83& 7
8 0.00 48.20$ 1461 " 46.69$ 27.37& 34.80$ 217.5 " 464.6 " 385.9 " 164.2 " 25.42& 0.22& 8
9 0.00 180.5 $ 1306 " 43.50$ 27.66& 33.54& 219.9 " 545.0 " 357.9 " 149.4 " 23.99& 0.03& 9
10 0.00 9757 " 1202 " 39.60$ 28.76& 32.89$ 209.1 " 909.7 " 330.6 " 136.2 " 20.18& 0.00& 10
11 0.00 15406 " 1138 " 36.79$ 28.45& 32.65& 205.5 " 1360 " 304.5 " 124.6 " 17.01& 0.00& 11
12 0.00 13371 " 1066 " 36.16$ 28.60& 32.41& 186.3 " 2414 " 284.3 " 115.4 " 15.63& 0.00& 12
13 0.00 11137 " 1021 " 35.82$ 28.83& 31.70$ 174.5 " 1948 " 267.1 " 109.4 # 14.81& 0.00" 13
14 0.00 9601 " 892.3 " 32.77$ 28.78& 36.43$ 165.6 " 2126 " 251.6 " 103.9 # 12.92& 0.00" 14
15 0.00 11780 " 746.4 " 32.17$ 28.63& 34.79$ 158.5 " 2976 " 239.7 " 101.4 " 12.87& 0.00" 15
16 0.00 14172 " 408.5 " 29.42& 30.53$ 33.56$ 147.8 " 3151 " 224.4 " 93.92" 13.96& 0.00" 16
17 0.00 14140 " 275.0 " 27.36& 31.04$ 32.64$ 150.3 " 3031 " 209.6 " 87.98# 19.11& 0.00" 17
18 0.00 11741 " 203.7 " 27.82& 30.99& 34.41$ 164.4 " 2177 " 195.5 " 81.32# 15.49& 0.00" 18
19 0.00 8748 " 153.1 " 27.94& 35.99$ 33.19$ 153.5 " 1679 " 183.8 " 77.38# 16.33& 0.00" 19
20 0.00 6763 " 124.3 " 27.73& 34.36$ 33.35$ 160.4 " 1496 " 178.2 " 71.22# 15.57& 0.00" 20
21 0.00 5411 " 117.6 " 28.32& 41.28$ 34.71$ 186.0 " 1342 " 178.0 " 67.20# 12.77& 0.00" 21
22 0.00 4311 " 127.0 " 28.69& 48.10$ 42.34$ 184.2 " 1352 " 206.5 " 65.51# 11.43& 0.00" 22
23 0.00 3464 " 158.8 " 28.58& 65.32# 44.41$ 188.8 " 1159 " 315.5 " 58.32# 11.59& 0.00" 23
24 0.00 3122 " 168.1 " 29.63$ 70.85# 55.04$ 249.8 " 980.5 " 329.4 " 55.30$ 10.84& 0.00" 24
25 0.00 2819 " 146.3 " 29.17& 67.23# 49.88$ 334.9 " 859.2 " 454.5 " 52.91$ 9.06& 0.00" 25
26 0.00 2538 " 133.8 " 29.34$ 71.02# 50.94$ 374.0 " 761.2 " 613.9 " 50.68$ 7.76& 0.00" 26
27 0.00 2302 " 125.2 " 29.76& 69.34# 51.96$ 354.7 " 687.6 " 538.6 " 96.07# 7.36& 0.00" 27
28 0.00 2132 " 111.6 " 30.78& 63.53# 76.16# 348.8 " 626.5 " 639.6 " 86.82# 8.43& 0.00" 28
29 0.00 105.9 " 33.56$ 58.10# 82.93# 381.4 " 582.2 " 565.0 " 71.87# 6.95& 0.00" 29
30 25.03& 94.63" 32.25$ 53.11$ 71.75# 412.0 " 547.7 " 441.0 " 62.99# 5.26& 0.00" 30
31 267.6 & 84.91# 49.17$ 519.2 " 517.4 " 56.01$ 0.00" 31
Mean 9.439&5509 & 815.0 # 39.60 & 40.15 & 42.44 & 223.8 #1237 " 379.1 " 128.3 $ 19.29 & 0.578&
Median 0.000&3293 & 408.5 # 32.51 & 30.53 & 36.48 & 186.3 # 859.2 " 344.3 " 96.07 $ 15.53 & 0.000&
Maximum 267.6 &15406 & 2125 # 75.04& 71.02& 82.93& 519.2 # 3151 " 639.6 " 362.4 $ 50.87& 4.40&
Minimum 0.000& 30.41 & 84.91 # 27.36 & 27.09 & 31.70 & 75.68 # 464.6 " 178.0 " 50.68 $ 5.259& 0.000&
Total 292.6&154240 & 25266 # 1188 & 1245 & 1273 & 6936 # 38342 " 11374 " 3977 $ 578.8& 17.9&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 670.5 & " ... Relative Uncertainty +/-10%
Ann. Median 65.51 & # ... Relative Uncertainty +/-15%
Annual Total 244730 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 15406 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2018
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000" 10.25 & 55.99 & 0.000" 0.000 67.96 # 506.3 " 720.0 "1220 " 58.82 # 14.40 & 0.000 1
2 0.000" 9.860& 106.6 # 0.000" 0.000 52.00 $ 449.0 "1482 " 844.3 " 57.72 $ 13.21 & 0.000 2
3 0.000" 7.968& 63.00 $ 0.000" 0.000 40.84 $ 648.8 "1351 " 602.1 " 54.48 $ 12.10 & 0.000 3
4 0.000" 5.591& 40.10 $ 0.000" 0.000 33.11 $ 654.4 "3357 " 488.8 " 60.32 # 9.634& 0.000 4
5 0.000" 4.717& 26.81 & 0.000" 0.000 36.78 & 855.7 "4124 " 447.3 " 79.28 # 7.801& 0.000 5
6 0.000" 5.999& 17.80 & 0.000" 0.000 39.44 $1216 "5873 " 415.4 " 85.14 # 7.611& 0.000 6
7 0.000" 3.219& 13.46 & 0.000" 0.000 78.41 #1129 "3208 " 364.7 " 87.35 # 7.859& 0.000 7
8 0.000" 2.193& 10.30 & 0.000" 0.000 111.2 "1291 "2098 " 353.6 " 233.3 " 7.323& 0.000 8
9 0.000" 3.386& 8.105& 0.000" 0.000 75.27 # 862.6 "2047 " 339.7 " 212.4 " 6.183& 0.000 9
10 0.000" 1.596& 4.331& 0.000" 0.000 68.36 # 618.9 "2898 " 311.9 " 151.5 " 6.140& 0.000 10
11 0.000" 1.654& 3.132& 0.000" 0.000 112.7 # 508.6 "3707 " 288.2 " 116.7 " 5.479& 0.000 11
12 0.000" 1.253& 3.025& 0.000" 0.000 121.6 " 435.8 "3321 " 274.2 " 93.19 # 3.934& 0.000 12
13 0.000" 0.769& 3.004& 0.000" 0.000 282.2 " 381.6 "1944 " 261.8 " 91.56 # 3.834& 0.000 13
14 0.000" 0.283& 3.388& 0.000" 0.000 541.4 " 357.0 "1476 " 252.4 " 95.88 # 3.076& 0.000 14
15 0.746& 0.081& 2.267& 0.000" 0.000 336.8 " 418.8 "1371 " 235.4 " 88.40 # 3.580& 0.000 15
16 249.7 $ 0.009& 1.448& 0.000" 0.000 234.2 " 443.8 "1231 " 214.4 " 87.99 # 2.095& 0.000 16
17 478.7 " 0.000& 0.970& 0.000" 0.000 182.6 " 486.7 "1217 " 195.9 " 78.52 # 2.240& 0.000 17
18 439.3 " 0.000" 0.358& 0.000" 0.000 159.9 " 610.3 " 979.3 " 179.3 " 73.84 # 1.671& 0.000 18
19 402.3 " 0.000" 0.272& 0.000" 0.000 162.3 " 528.7 " 789.3 " 164.6 " 67.74 # 0.792& 0.000 19
20 422.0 " 0.000" 0.142& 0.000" 0.000 153.1 " 446.2 " 687.0 " 153.4 " 63.37 # 0.335& 0.000 20
21 245.1 " 0.000" 0.068& 0.000 0.000 134.8 " 380.1 " 619.7 " 143.0 " 55.38 $ 0.260& 0.000 21
22 148.1 " 0.000" 0.069& 0.000 0.000 162.7 " 387.1 " 628.6 " 131.3 " 48.23 $ 0.419& 0.000 22
23 95.84 # 0.000" 0.012& 0.000 0.000 184.9 " 508.1 " 564.6 " 119.2 " 43.63 $ 0.091& 0.000 23
24 66.97 # 0.000" 0.000& 0.000 0.007& 155.9 " 598.6 " 509.6 " 106.5 " 39.66 $ 0.194& 0.000 24
25 48.26 $ 0.000" 0.000" 0.000 6.112& 132.1 "1034 " 493.4 " 93.13 # 33.17 & 0.218& 0.000 25
26 39.69 & 16.19 & 0.000" 0.000 13.95 & 116.0 "1312 " 458.3 " 84.52 # 30.13 & 0.044& 0.000 26
27 33.20 & 41.71 & 0.000" 0.000 44.74 $ 110.4 "1108 " 412.2 " 77.59 # 26.28 & 0.003& 0.000 27
28 24.53 & 14.93 & 0.000" 0.000 33.35 $ 116.9 "1715 " 450.6 " 70.69 # 24.87 & 0.000& 0.000 28
29 17.23 & 0.000" 0.000 67.84 $ 133.4 "1773 " 834.0 " 66.14 # 21.94 & 0.000 0.000 29
30 12.77 & 0.000" 0.000 101.2 # 164.3 "1046 " 737.9 " 62.52 # 18.60 & 0.000 0.000 30
31 11.20 & 0.000" 91.48 # 775.6 " 986.4 " 16.73 & 0.000 31
Mean 88.25 & 4.702& 11.76 & 0.000" 11.57 & 143.4 & 757.7 "1631 " 285.4 # 74.06 & 4.018& 0.000
Median 11.20 & 1.425& 1.448& 0.000" 0.000& 126.9 & 610.3 "1217 " 224.9 # 63.37 & 2.658& 0.000
Maximum 478.7 & 41.71 & 106.6 & 0.000" 101.2 & 541.4 &1773 "5873 "1220 # 233.3 & 14.40 & 0.000
Minimum 0.000& 0.000& 0.000& 0.000" 0.000& 33.11 & 357.0 " 412.2 " 62.52 # 16.73 & 0.000& 0.000
Total 2736 & 131.7 & 364.6 & 0.00" 358.6 & 4302 &23488 "50576 " 8562 # 2296 & 120.5 & 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 254.6 & " ... Relative Uncertainty +/-10%
Ann. Median 13.95 & # ... Relative Uncertainty +/-15%
Annual Total 92936 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 5873 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2019
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 0.000 380.8 " 177.1 " 533.5 " 29.73 & 3.439& 0.000 1
2 0.000 0.000 0.000 0.000 0.000 0.000 332.3 " 161.0 "1006 " 26.96 & 4.197& 0.000 2
3 0.000 0.000 0.000 0.000 0.000 0.000 258.9 " 143.1 "1232 " 24.58 & 3.072& 0.000 3
4 0.000 0.000 0.000 0.000 0.000 0.000 261.3 " 130.2 "1093 " 22.56 & 3.126& 0.000 4
5 0.000 0.000 0.000 0.000 0.000 0.000 612.8 " 128.2 " 860.2 " 19.52 & 3.731& 0.000 5
6 0.000 0.000 0.000 0.000 0.000 0.000 853.1 " 130.8 " 647.7 " 20.92 & 2.578& 0.000 6
7 0.000 0.000 0.000 0.000 0.000 0.000 820.3 " 174.0 " 512.4 " 19.64 & 2.599& 0.000 7
8 0.000 0.000 0.000 0.000 0.000 0.000 862.5 " 256.4 " 397.5 " 17.32 & 1.821& 0.000 8
9 0.000 0.000 0.000 0.000 0.000 0.000 662.9 " 318.8 " 315.0 " 15.39 & 1.334& 0.000 9
10 0.000 0.000 0.000 0.000 0.000 0.000 533.7 " 315.5 " 261.0 " 14.17 & 2.004& 0.000 10
11 0.000 0.000 0.000 0.000 0.000 0.000 459.0 " 257.8 " 222.0 " 13.44 & 1.193& 0.000 11
12 0.000 0.000 0.000 0.000 0.000 0.000 383.4 " 209.1 " 191.8 " 14.87 & 0.425& 0.000 12
13 0.000 0.000 0.000 0.000 0.000 0.000 314.5 " 175.9 " 169.3 " 14.10 & 0.234& 0.000 13
14 0.000 0.000 0.000 0.000 0.000 0.000 267.0 " 162.2 " 148.8 " 13.06 & 0.211& 0.000 14
15 0.000 0.000 0.000 0.000 0.000 35.11 & 233.6 " 260.3 " 130.8 " 12.55 & 0.084& 0.000 15
16 0.000 0.000 0.000 0.000 0.000 82.42 # 208.8 " 407.4 " 115.8 " 11.93 & 0.019& 0.000 16
17 0.000 0.000 0.000 0.000 0.000 83.20 # 192.4 " 527.3 " 102.6 " 11.14 & 0.000& 0.000 17
18 0.000 0.000 0.000 0.000 0.000 88.88 # 183.0 " 567.7 " 92.26 # 9.674& 0.000 0.000 18
19 0.000 0.000 0.000 0.000 0.000 79.92 # 189.4 " 615.7 " 84.47 # 8.783& 0.000 0.000 19
20 0.000 0.000 0.000 0.000 0.000 70.37 # 238.4 " 641.7 " 85.78 # 8.464& 0.000 0.000 20
21 0.000 0.000 0.000 0.000 0.000 64.14 # 349.9 " 537.6 " 75.17 # 7.134& 0.000 0.000 21
22 0.000 0.000 0.000 0.000 0.000 62.06 $ 380.1 " 402.4 " 66.24 # 6.789& 0.000 0.000 22
23 0.000 0.000 0.000 0.000 0.000 75.98 $ 458.7 " 356.1 " 60.69 # 5.889& 0.000 0.000 23
24 0.000 0.000 0.000 0.000 0.000 120.1 # 467.6 " 415.7 " 55.64 $ 4.778& 0.000 0.000 24
25 0.000 0.000 0.000 0.000 0.000 148.9 " 390.1 " 364.8 " 50.60 $ 4.102& 0.000 0.000 25
26 0.000 0.000 0.000 0.000 0.000 148.3 " 352.0 " 354.1 " 47.24 $ 4.476& 0.000 0.000 26
27 0.000 0.000 0.000 0.000 0.000 334.6 " 310.5 " 373.9 " 43.28 $ 4.113& 0.000 0.000 27
28 0.000 0.000 0.000 0.000 0.000 533.3 " 276.5 " 293.9 " 39.34 $ 3.599& 0.000 0.000 28
29 0.000 0.000 0.000 0.000 444.1 " 249.3 " 241.4 " 36.30 $ 2.033& 0.000 0.000 29
30 0.000 0.000 0.000 0.000 395.9 " 215.5 " 233.9 " 32.92 & 2.964& 0.000 0.000 30
31 0.000 0.000 0.000 196.3 " 366.9 " 3.471& 0.000 31
Mean 0.000 0.000 0.000 0.000 0.000 92.24 & 383.7 " 312.9 " 290.3 & 12.20 & 1.002& 0.000
Median 0.000 0.000 0.000 0.000 0.000 48.58 & 332.3 " 293.9 " 123.3 & 11.93 & 0.052& 0.000
Maximum 0.000 0.000 0.000 0.000 0.000 533.3 & 862.5 " 641.7 "1232 & 29.73 & 4.197& 0.000
Minimum 0.000 0.000 0.000 0.000 0.000 0.000& 183.0 " 128.2 " 32.92 & 2.033& 0.000& 0.000
Total 0.00 0.00 0.00 0.00 0.00 2767 &11894 " 9701 " 8709 & 378.1 & 30.07& 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 91.73 & " ... Relative Uncertainty +/-10%
Ann. Median 0.000& # ... Relative Uncertainty +/-15%
Annual Total 33480 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 1232 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2020
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 0.000 106.8 " 48.35 $ 48.65 $ 24.91 & 0.801& 0.039& 1
2 0.000 0.000 0.000 0.000 0.000 0.000 158.6 " 44.95 $ 57.65 $ 21.09 & 1.830& 0.024& 2
3 0.000 0.000 0.000 0.000 0.000 0.000 193.7 " 44.82 $ 58.16 $ 19.83 & 1.553& 0.001& 3
4 0.000 0.000 0.000 0.000 0.000 0.000 154.2 " 44.18 $ 49.58 $ 18.88 & 0.708& 0.001& 4
5 0.000 0.000 0.000 0.000 0.000 0.000 141.9 " 44.58 $ 44.65 $ 18.19 & 0.957& 0.000 5
6 0.000 0.000 0.000 0.000 0.000 0.000 131.7 " 45.46 $ 43.54 $ 16.38 & 1.105& 0.000 6
7 0.000 0.000 0.000 0.000 0.000 0.000 109.7 " 44.66 $ 44.71 $ 14.01 & 1.340& 0.000 7
8 0.000 0.000 0.000 0.000 0.000 0.000 90.02 # 52.63 $ 62.80 $ 12.16 & 1.048& 0.000 8
9 0.000 0.000 0.000 0.000 0.000 0.000 74.67 # 63.71 $ 67.06 # 11.54 & 1.918& 0.000 9
10 0.000 0.000 0.000 0.000 0.000 0.000 64.18 # 113.5 # 87.18 # 10.55 & 5.235& 0.000 10
11 0.000 0.000 0.000 0.000 0.000 0.000 57.71 $ 246.2 " 220.1 " 9.175& 3.094& 0.000 11
12 0.000 0.000 0.000 0.000 0.000 0.000 52.55 $ 222.0 " 156.7 " 8.264& 3.750& 0.000 12
13 0.000 0.000 0.000 0.000 0.000 0.000 46.92 $ 360.1 " 113.1 " 7.291& 4.782& 0.000 13
14 0.000 0.000 0.000 0.000 0.000 0.000 50.62 $ 391.1 " 86.05 # 6.116& 11.00 & 0.000 14
15 0.000 0.000 0.000 0.000 0.000 0.000 76.01 $ 287.2 " 67.98 # 5.340& 8.981& 0.000 15
16 0.000 0.000 0.000 0.000 0.000 0.000 88.25 # 251.0 " 55.55 $ 5.191& 10.53 & 0.000 16
17 0.000 0.000 0.000 0.000 0.000 0.000 83.50 # 322.1 " 47.19 $ 3.768& 12.36 & 0.000 17
18 0.000 0.000 0.000 0.000 0.000 0.000 192.6 " 276.3 " 40.07 $ 3.374& 13.82 & 0.000 18
19 0.000 0.000 0.000 0.000 0.000 0.000 238.7 " 240.9 " 33.68 & 3.920& 13.07 & 0.000 19
20 0.000 0.000 0.000 0.000 0.000 0.000 197.3 " 256.6 " 30.23 & 2.553& 10.29 & 0.000 20
21 0.000 0.000 0.000 0.000 0.000 0.000 216.8 " 233.1 " 28.62 & 1.956& 8.451& 0.000 21
22 0.000 0.000 0.000 0.000 0.000 0.000 177.2 " 183.0 " 28.78 & 1.534& 6.608& 0.000 22
23 0.000 0.000 0.000 0.000 0.000 0.000 137.4 " 145.0 " 26.24 & 1.414& 7.143& 0.000 23
24 0.000 0.000 0.000 0.000 0.000 0.090& 113.0 " 118.3 " 22.77 & 1.358& 5.915& 0.000 24
25 0.000 0.000 0.000 0.000 0.000 16.19 & 93.38 # 98.61 " 20.39 & 1.227& 2.554& 0.000 25
26 0.000 0.000 0.000 0.000 0.000 23.45 & 78.85 # 84.59 # 23.20 & 1.305& 3.076& 0.000 26
27 0.000 0.000 0.000 0.000 0.000 22.85 & 68.58 # 74.13 # 29.21 & 0.555& 1.537& 0.000 27
28 0.000 0.000 0.000 0.000 0.000 23.05 & 64.68 # 65.92 $ 46.67 $ 0.310& 0.546& 0.000 28
29 0.000 0.000 0.000 0.000 0.000 27.76 & 60.47 # 58.98 $ 34.58 $ 0.091& 0.444& 0.000 29
30 0.000 0.000 0.000 0.000 94.13 # 55.58 # 53.61 $ 31.43 & 0.022& 0.561& 0.000 30
31 0.000 0.000 0.000 52.17 $ 47.53 $ 0.015& 0.000 31
Mean 0.000 0.000 0.000 0.000 0.000 6.917& 110.6 $ 147.2 $ 56.89 & 7.494& 4.834& 0.002&
Median 0.000 0.000 0.000 0.000 0.000 0.000& 90.02 $ 98.61 $ 45.69 & 5.191& 3.085& 0.000&
Maximum 0.000 0.000 0.000 0.000 0.000 94.13 & 238.7 $ 391.1 $ 220.1 & 24.91 & 13.82 & 0.039&
Minimum 0.000 0.000 0.000 0.000 0.000 0.000& 46.92 $ 44.18 $ 20.39 & 0.015& 0.444& 0.000&
Total 0.000 0.000 0.000 0.000 0.000 207.5 &3428 $4563 $1707 & 232.3 & 145.0 & 0.065&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 28.09 & " ... Relative Uncertainty +/-10%
Ann. Median 0.000& # ... Relative Uncertainty +/-15%
Annual Total 10282 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 391.1 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2021
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.00 0.00 0.00 5.93& 5.13& 781.6 " 217.4 "10632 " 1007 " 199.6 " 228.0 " 9.51& 1
2 0.00 0.00 0.00 6.66& 5.80& 751.6 " 197.2 "10380 " 1098 " 231.6 " 178.8 " 7.31& 2
3 0.00 0.00 276.7 & 5.17& 4.78& 613.0 " 193.1 "10508 " 1208 " 250.4 " 147.8 " 5.55& 3
4 0.00 0.00 1092 " 4.46& 37.91& 495.3 " 196.2 " 7506 " 1188 " 237.2 " 127.9 " 4.78& 4
5 0.00 0.00 791.9 " 5.22& 95.83& 400.0 " 301.7 " 5951 " 1148 " 246.9 " 108.4 " 6.11& 5
6 0.00 0.00 746.0 " 4.70& 235.6 " 323.1 " 441.8 " 5106 " 1007 " 241.3 " 94.07# 3.78& 6
7 0.00 0.00 690.9 " 3.92& 239.3 " 270.7 " 1221 " 4400 " 886.0 " 210.4 " 82.13# 1.43& 7
8 0.00 0.00 520.3 " 2.47& 275.6 " 234.8 " 1648 " 5111 " 801.0 " 183.1 " 71.86# 1.04& 8
9 0.00 0.00 265.2 " 0.73& 481.5 " 209.2 " 2082 " 4880 " 756.1 " 162.2 " 64.03$ 0.91& 9
10 0.00 0.00 169.7 " 0.58& 423.7 " 215.6 " 3396 " 6114 " 818.6 " 148.6 " 59.70# 0.72& 10
11 0.00 0.00 122.1 " 2.92& 377.9 " 288.1 " 3007 " 7765 " 865.0 " 135.9 " 58.66# 0.22& 11
12 0.00 0.00 102.9 " 6.44& 304.8 " 279.4 " 4898 " 9771 " 1064 " 125.3 " 55.05$ 0.04& 12
13 0.00 0.00 85.99# 2.17& 228.6 " 250.5 " 5085 " 7297 " 1052 " 120.6 " 49.17$ 0.01& 13
14 0.00 0.00 67.42$ 3.04& 168.8 " 290.5 " 5986 " 5457 " 826.3 " 112.2 " 42.63$ 0.00& 14
15 0.00 0.00 53.77$ 3.72& 132.8 " 291.1 " 7059 " 4460 " 708.2 " 104.7 " 37.67$ 0.00 15
16 0.00 0.00 42.41$ 4.13& 110.4 " 243.1 " 5089 " 3610 " 699.1 " 96.22# 35.58$ 0.00 16
17 0.00 0.00 34.44$ 4.99& 94.33# 203.0 " 3672 " 3238 " 657.4 " 89.21# 32.52& 0.00 17
18 0.00 0.00 30.47$ 4.09& 81.82# 175.4 " 2863 " 2977 " 496.3 " 86.73# 25.78& 0.00 18
19 0.00 0.00 27.71& 3.04& 71.10# 162.6 " 2514 " 2778 " 498.3 " 106.4 # 24.03& 0.00 19
20 0.00 0.00 21.67& 3.49& 61.83# 163.5 " 2349 " 2641 " 492.5 " 143.3 " 24.69& 0.00 20
21 0.00 0.00 17.68& 4.38& 55.71# 181.1 " 6033 " 2453 " 404.5 " 200.4 " 23.61& 0.00 21
22 0.00 0.00 14.36& 4.03& 53.17$ 261.7 "10725 " 2297 " 343.1 " 196.8 " 20.31& 0.00 22
23 0.00 0.00 9.58& 4.71& 55.53$ 309.1 "13644 " 2149 " 305.1 " 167.4 " 20.06& 0.00 23
24 0.00 0.00 9.87& 4.85& 51.74$ 368.9 " 7685 " 1995 " 271.9 " 170.7 " 22.62& 0.00 24
25 0.00 0.00 11.03& 8.40& 53.41$ 435.2 " 6140 " 1849 " 246.3 " 173.4 " 23.09& 0.00 25
26 0.00 0.00 11.10& 6.99& 56.08$ 337.9 " 4497 " 1540 " 227.6 " 160.0 " 23.47& 0.00 26
27 0.00 0.00 13.99& 5.77& 54.55$ 278.4 " 5542 " 1380 " 212.9 " 162.1 " 21.83& 0.00 27
28 0.00 0.00 13.86& 5.83& 60.11# 242.5 "10750 " 1297 " 206.5 " 238.7 " 17.55& 0.00 28
29 0.00 11.22& 6.15& 313.6 " 221.6 "12565 " 1231 " 205.4 " 211.9 " 12.28& 0.00 29
30 0.00 7.91& 5.23& 1013 " 216.5 " 9230 " 1117 " 200.8 " 223.6 " 9.21& 0.00 30
31 0.00 6.54& 823.7 " 10473 " 1028 " 275.2 " 0.00 31
Mean 0.000 0.000 170.0 & 4.475& 194.5 & 316.5 "4829 "4481 " 663.3 " 174.6 # 58.08 & 1.336&
Median 0.000 0.000 30.47 & 4.581& 94.33 & 274.6 "4497 "3610 " 703.7 " 170.7 # 36.63 & 0.000&
Maximum 0.00 0.00 1092 & 8.40& 1013 & 781.6 "13644 "10632 " 1208 " 275.2 # 228.0 & 9.51&
Minimum 0.000 0.000 0.000& 0.583& 4.782& 162.6 " 193.1 "1028 " 200.8 " 86.73 # 9.212& 0.000&
Total 0.0 0.0 5269 & 134.2& 6028 & 9495 "149702 "138919 " 19900 " 5412 # 1743 & 41.4&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 922.3 & " ... Relative Uncertainty +/-10%
Ann. Median 94.07 & # ... Relative Uncertainty +/-15%
Annual Total 336644 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 13644 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2022
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.00 0.00 0.00 0.00 0.00 87.81# 357.1 " 1127 " 2417 " 493.3 " 63.18# 6.88& 1
2 0.00 0.00 0.00 0.00 0.00 72.00# 338.7 " 1944 " 2189 " 469.4 " 55.59$ 6.03& 2
3 0.00 0.00 0.00 0.00 0.00 58.89# 320.9 " 3055 " 2172 " 417.5 " 49.02$ 5.35& 3
4 0.00 0.00 0.00 0.00 0.00 51.04$ 300.8 " 6449 " 2801 " 345.0 " 42.66$ 3.32& 4
5 0.00 0.00 0.00 0.00 0.00 45.42$ 281.8 " 8145 " 3938 " 310.2 " 38.72$ 2.18& 5
6 0.00 0.00 0.00 0.00 0.00 41.52$ 266.0 " 5917 " 4192 " 291.6 " 35.04& 1.68& 6
7 0.00 0.00 0.00 0.00 0.00 38.23$ 252.6 " 3621 " 3799 " 277.0 " 32.20& 1.43& 7
8 0.00 0.00 0.00 0.00 0.00 35.56& 233.3 " 2556 " 3311 " 263.5 " 78.87$ 1.23& 8
9 0.00 0.00 0.00 0.00 0.00 36.51& 203.3 " 2780 " 2914 " 254.0 " 83.36# 1.03& 9
10 0.00 0.00 0.00 0.00 0.00 39.81$ 191.4 " 3440 " 2616 " 248.9 " 79.90# 0.71& 10
11 0.00 0.00 0.00 0.00 0.00 56.07$ 211.7 " 3204 " 2285 " 242.4 " 53.67$ 0.29& 11
12 0.00 0.00 0.00 0.00 0.00 119.2 " 216.0 " 2961 " 2070 " 234.8 " 37.30& 0.16& 12
13 0.00 0.00 0.00 0.00 0.00 258.3 " 277.8 " 2180 " 1975 " 223.8 " 31.32& 0.58& 13
14 0.00 0.00 0.00 0.00 0.00 695.7 " 333.9 " 2201 " 2298 " 214.1 " 26.37& 0.74& 14
15 0.00 0.00 0.00 0.00 0.00 902.0 " 328.4 " 2052 " 2381 " 205.1 " 22.69& 0.61& 15
16 0.00 0.00 0.00 0.00 0.00 736.0 " 332.2 " 5656 " 2432 " 196.7 " 19.72& 0.37& 16
17 0.00 0.00 0.00 0.00 0.00 556.7 " 307.8 " 7803 " 2025 " 189.5 " 16.36& 0.14& 17
18 0.00 0.00 0.00 0.00 0.00 509.3 " 389.1 "14079 " 1746 " 182.6 " 19.93& 0.04& 18
19 0.00 0.00 0.00 0.00 0.00 567.2 " 436.8 "15425 " 1613 " 175.8 " 16.82& 0.01& 19
20 0.00 0.00 0.00 0.00 0.00 709.4 " 415.5 "10573 " 1548 " 169.8 " 17.69& 0.00& 20
21 0.00 0.00 0.00 0.00 0.00 1029 " 451.0 " 7265 " 1460 " 155.7 " 17.69& 0.00 21
22 0.00 0.00 0.00 0.00 0.00 940.7 " 429.6 " 5403 " 1345 " 119.1 " 15.32& 0.00 22
23 0.00 0.00 0.00 0.00 0.00 937.1 " 403.8 " 4333 " 974.0 " 95.38# 15.01& 0.00 23
24 0.00 0.00 0.00 0.00 0.00 715.9 " 494.4 " 4267 " 738.8 " 84.88# 13.31& 0.00 24
25 0.00 0.00 0.00 0.00 0.00 556.4 " 601.4 " 4240 " 645.4 " 83.91# 12.68& 0.00 25
26 0.00 0.00 0.00 0.00 0.00 520.2 " 855.7 " 3864 " 632.5 " 87.79# 11.91& 0.00 26
27 0.00 0.00 0.00 0.00 1.00& 543.5 " 1000 " 3534 " 639.9 " 78.82# 10.44& 0.00 27
28 0.00 0.00 0.00 0.00 115.2 & 489.7 " 779.0 " 3282 " 613.7 " 82.67# 9.87& 0.00 28
29 0.00 0.00 0.00 153.3 " 430.8 " 646.4 " 3034 " 585.1 " 86.78# 9.15& 0.00 29
30 0.00 0.00 0.00 124.9 " 386.1 " 739.7 " 2849 " 538.6 " 77.32# 8.39& 0.00 30
31 0.00 0.00 105.9 " 811.1 " 2663 " 71.25# 0.00 31
Mean 0.000 0.000 0.000 0.000 16.14 & 405.5 & 426.0 "4836 "1963 " 207.4 # 31.47 & 1.057&
Median 0.000 0.000 0.000 0.000 0.000& 460.2 & 338.7 "3534 "2048 " 196.7 # 21.31 & 0.164&
Maximum 0.00 0.00 0.00 0.00 153.3 & 1029 & 1000 "15425 " 4192 " 493.3 # 83.36& 6.88&
Minimum 0.000 0.000 0.000 0.000 0.000& 35.56 & 191.4 "1127 " 538.6 " 71.25 # 8.391& 0.000&
Total 0.0 0.0 0.0 0.0 500.3& 12166 & 13207 "149905 " 58896 " 6429 # 944.2& 32.8&
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 663.2 & " ... Relative Uncertainty +/-10%
Ann. Median 11.91 & # ... Relative Uncertainty +/-15%
Annual Total 242080 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 15425 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2023
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 333.6 " 487.7 " 64.00 # 382.1 " 581.5 " 177.0 " 71.99 # 7.536& 0.000 1
2 0.000 0.000 0.000 595.8 " 425.0 " 85.08 # 344.9 " 553.0 " 165.9 " 63.25 $ 5.995& 0.000 2
3 0.000 0.000 0.000 969.5 " 386.7 " 140.3 " 324.1 " 470.9 " 166.6 " 59.33 # 4.509& 0.000 3
4 0.000 0.000 0.000 658.7 " 358.8 " 403.8 " 318.4 " 428.8 " 188.5 " 54.32 $ 2.817& 0.000 4
5 0.000 0.000 0.000 433.5 " 334.0 " 332.1 " 359.1 " 576.2 " 205.2 " 51.38 $ 3.048& 0.000 5
6 0.000 0.000 0.000 366.1 " 325.9 " 487.3 " 411.9 " 901.5 " 229.4 " 47.48 $ 2.601& 0.000 6
7 0.000 0.000 0.000 316.2 " 322.2 "1869 " 575.4 " 663.7 " 275.5 " 43.03 $ 1.615& 0.000 7
8 0.000 0.000 0.000 274.9 " 312.3 "4924 " 618.3 " 545.8 " 254.3 " 36.80 & 0.950& 0.000 8
9 0.000 0.000 0.000 285.1 " 313.8 "3850 " 512.8 " 499.9 " 232.3 " 34.45 $ 0.960& 0.000 9
10 0.000 0.000 0.000 338.0 " 310.9 "2572 " 440.1 " 472.5 " 214.6 " 30.49 & 0.305& 0.000 10
11 0.000 0.000 0.000 577.7 " 304.6 "1761 " 406.3 " 496.4 " 183.6 " 27.36 & 0.081& 0.000 11
12 0.000 0.000 0.000 477.3 " 264.6 "1329 " 382.6 " 572.1 " 158.4 " 24.88 & 0.565& 0.000 12
13 0.000 0.000 0.000 442.0 " 224.9 "1169 " 362.3 " 671.1 " 172.0 " 22.28 & 2.018& 0.000 13
14 0.000 0.000 0.000 441.8 " 188.9 "1105 " 342.3 " 833.9 " 298.1 " 19.77 & 2.244& 0.000 14
15 0.000 0.000 0.000 474.8 " 143.6 " 888.0 " 328.5 " 655.0 " 421.8 " 18.20 & 1.481& 0.000 15
16 0.000 0.000 0.000 470.7 " 113.7 " 767.5 " 314.5 " 578.2 " 660.5 " 16.91 & 0.547& 0.000 16
17 0.000 0.000 0.000 442.7 " 98.83 " 817.7 " 305.2 " 664.4 " 777.9 " 15.54 & 0.113& 0.000 17
18 0.000 0.000 0.000 417.2 " 89.16 # 879.4 " 287.1 "1075 " 512.5 " 14.68 & 0.014& 0.000 18
19 0.000 0.000 0.000 395.1 " 82.44 #1121 " 279.8 "1321 " 373.7 " 15.93 & 0.000& 0.000 19
20 0.000 0.000 0.000 374.5 " 78.63 # 854.2 " 300.1 " 839.6 " 301.7 " 15.43 & 0.000 0.000 20
21 0.000 0.000 0.000 359.3 " 75.76 # 689.1 " 334.2 " 634.9 " 253.1 " 16.34 & 0.000 0.000 21
22 0.000 0.000 0.000 348.5 " 72.92 # 694.7 " 506.3 " 536.4 " 212.3 " 15.52 & 0.000 0.000 22
23 0.000 0.000 0.000 333.5 " 70.15 # 848.1 " 537.9 " 468.7 " 180.0 " 12.65 & 0.000 0.000 23
24 0.000 0.000 0.000 325.5 " 67.44 # 732.1 " 430.9 " 417.9 " 157.3 " 13.36 & 0.000 0.000 24
25 0.000 0.000 0.000 316.0 " 63.51 $ 613.3 " 373.8 " 372.9 " 138.2 " 12.52 & 0.000 0.000 25
26 0.000 0.000 0.000 313.2 " 58.86 # 579.0 " 348.9 " 332.9 " 124.1 " 12.11 & 0.000 0.000 26
27 0.000 0.000 166.1 & 325.5 " 57.25 # 536.7 " 389.5 " 295.3 " 111.0 " 8.941& 0.000 0.000 27
28 0.000 0.000 3553 " 548.7 " 55.16 # 494.2 " 465.6 " 272.9 " 98.75 " 9.355& 0.000 0.000 28
29 0.000 1846 " 754.2 " 53.18 # 462.0 " 777.6 " 250.5 " 89.31 # 8.802& 0.000 0.000 29
30 0.000 684.8 " 622.2 " 51.37 $ 424.8 " 768.0 " 215.4 " 79.97 # 7.219& 0.000 0.000 30
31 0.000 416.1 " 62.19 $ 606.6 " 192.4 " 6.928& 0.000 31
Mean 0.000 0.000 215.0 & 444.4 " 188.9 $1050 # 423.7 " 561.0 " 247.1 # 26.04 & 1.247& 0.000
Median 0.000 0.000 0.000& 406.1 " 113.7 $ 749.8 # 382.1 " 545.8 " 196.9 # 16.91 & 0.209& 0.000
Maximum 0.000 0.000 3553 & 969.5 " 487.7 $4924 # 777.6 "1321 " 777.9 # 71.99 & 7.536& 0.000
Minimum 0.000 0.000 0.000& 274.9 " 51.37 $ 64.00 # 279.8 " 192.4 " 79.97 # 6.928& 0.000& 0.000
Total 0.00 0.00 6666 &13332 " 5855 $31493 #13135 "17390 " 7414 # 807.2 & 37.40& 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 263.4 & " ... Relative Uncertainty +/-10%
Ann. Median 63.51 & # ... Relative Uncertainty +/-15%
Annual Total 96129 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 4924 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2024
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 0.000 53.42 $ 798.3 " 576.5 " 47.36 $ 4.793& 0.000 1
2 0.000 0.000 0.000 0.000 0.000 0.000 69.44 # 714.9 " 530.3 " 50.00 $ 3.372& 0.000 2
3 0.000 0.000 0.000 0.000 0.000 0.000 75.09 #1078 " 449.7 " 63.27 $ 2.994& 0.000 3
4 0.000 0.000 0.000 0.000 0.000 0.000 67.99 #1113 " 384.7 " 110.4 # 2.607& 0.000 4
5 0.000 0.000 0.000 0.000 0.000 0.019& 60.06 $ 745.4 " 379.2 " 109.1 " 2.267& 0.000 5
6 0.000 0.000 0.000 0.000 0.000 19.40 & 52.74 $ 598.3 " 559.5 " 92.84 # 1.498& 0.000 6
7 0.000 0.000 0.000 0.000 0.000 39.34 & 56.37 $ 583.8 " 544.2 " 114.0 " 1.292& 0.000 7
8 0.000 0.000 0.000 0.000 0.000 61.69 # 48.46 $ 981.8 " 929.1 " 116.8 " 13.34 & 0.000 8
9 0.000 0.000 0.000 0.000 0.000 50.57 $ 49.33 $2435 " 719.0 " 93.01 # 5.652& 0.000 9
10 0.000 0.000 0.000 0.000 0.000 41.78 $ 60.99 $2761 " 512.1 " 75.21 # 5.460& 0.000 10
11 0.000 0.000 0.000 0.000 0.000 139.7 # 55.25 #1480 " 407.3 " 61.81 # 5.211& 0.000 11
12 0.000 0.000 0.000 0.000 0.000 106.8 " 68.07 #1112 " 344.0 " 51.55 $ 3.639& 0.000 12
13 0.000 0.000 0.000 0.000 0.000 82.76 # 89.75 # 984.6 " 306.3 " 43.74 $ 3.079& 0.000 13
14 0.000 0.000 0.000 0.000 0.000 86.63 # 176.7 " 883.4 " 269.8 " 37.10 & 2.756& 0.000 14
15 0.000 0.000 0.000 0.000 0.000 94.32 " 160.8 " 840.6 " 233.7 " 32.42 & 1.519& 0.000 15
16 0.000 0.000 0.000 0.000 0.000 86.19 # 126.2 " 849.5 " 199.4 " 28.39 & 0.567& 0.000 16
17 0.000 0.000 0.000 0.000 0.000 74.68 # 105.6 " 840.4 " 175.5 " 24.00 & 0.121& 0.000 17
18 0.000 0.000 0.000 0.000 0.000 67.22 # 140.5 " 786.6 " 155.9 " 21.17 & 0.047& 0.000 18
19 0.000 0.000 0.000 0.000 0.000 60.25 # 162.3 " 862.8 " 136.2 " 18.93 & 0.063& 0.000 19
20 0.000 0.000 0.000 0.000 0.000 56.21 $ 221.8 " 871.7 " 119.9 " 17.12 & 3.928& 0.000 20
21 0.000 0.000 0.000 0.000 0.000 53.86 $ 254.9 "1108 " 105.1 " 14.68 & 8.420& 0.000 21
22 0.000 0.000 0.000 0.000 0.000 48.28 $ 384.9 " 794.7 " 94.28 " 13.38 & 2.425& 0.000 22
23 0.000 0.000 0.000 0.000 0.000 41.46 $ 374.2 " 732.2 " 83.06 # 12.28 & 0.908& 0.000 23
24 0.000 0.000 0.000 0.000 0.000 40.14 $ 386.3 " 822.1 " 72.80 # 11.65 & 1.179& 0.000 24
25 0.000 0.000 0.000 0.000 0.000 38.73 $ 586.6 "1263 " 66.73 # 10.06 & 1.427& 0.000 25
26 0.000 0.000 0.000 0.000 0.000 37.87 $1161 "1187 " 61.53 # 8.350& 0.326& 0.000 26
27 0.000 0.000 0.000 0.000 0.000 48.13 $ 836.0 "1610 " 61.16 $ 8.033& 0.038& 0.000 27
28 0.000 0.000 0.000 0.000 0.000 48.64 $ 637.9 "1113 " 55.40 $ 7.624& 0.001& 0.000 28
29 0.000 0.000 0.000 0.000 0.000 39.28 $ 670.9 " 825.0 " 56.21 # 7.187& 0.000 0.000 29
30 0.000 0.000 0.000 0.000 50.50 $ 636.5 " 714.9 " 53.13 $ 5.740& 0.000 0.000 30
31 0.000 0.000 0.000 606.9 " 645.2 " 5.162& 0.000 31
Mean 0.000 0.000 0.000 0.000 0.000 50.48 & 272.1 $1037 " 288.1 $ 42.33 & 2.631& 0.000
Median 0.000 0.000 0.000 0.000 0.000 48.46 & 140.5 $ 862.8 " 216.6 $ 28.39 & 1.893& 0.000
Maximum 0.000 0.000 0.000 0.000 0.000 139.7 &1161 $2761 " 929.1 $ 116.8 & 13.34 & 0.000
Minimum 0.000 0.000 0.000 0.000 0.000 0.000& 48.46 $ 583.8 " 53.13 $ 5.162& 0.000& 0.000
Total 0.00 0.00 0.00 0.00 0.00 1514 & 8437 $32138 " 8642 $ 1312 & 78.93& 0.00
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 142.4 & " ... Relative Uncertainty +/-10%
Ann. Median 0.000& # ... Relative Uncertainty +/-15%
Annual Total 52122 & $ ... Relative Uncertainty +/-20%
& ... Relative Uncertainty +/-30%
Maximum Minimum
Daily 2761 & 0.000&
Department of Water and Environmental Regulation HYDAY V146 Output 13/11/2025
Site 615062 Avon River - Northam Weir Year 2025
VarFrom 10.00 Stage - SL in Metres Table Type Total
VarTo 151.00 Stream Discharge Volume in Megalitres
Figures are for period ending 24:00
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Day
1 0.000 0.000 0.000 0.000 0.000 0.000 0.000 341.8 "1003 " 102.2 " 11.55 & [ ] 1
2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 256.4 " 771.7 " 92.43 " 10.94 & [ ] 2
3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 245.7 " 627.7 " 82.95 # 10.02 & [ ] 3
4 0.000 0.000 0.000 0.000 0.000 0.000 0.024& 313.3 " 536.3 " 76.43 # 8.379& [ ] 4
5 0.000 0.000 0.000 0.000 0.000 0.000 4.934& 403.9 " 483.2 " 72.52 # 8.463& [ ] 5
6 0.000 0.000 0.000 0.000 0.000 0.000 8.910& 922.1 " 586.8 " 66.54 # 7.066& [ ] 6
7 0.000 0.000 0.000 0.000 0.000 0.000 9.921& 850.7 " 639.7 " 62.78 $ 18.53 & [ ] 7
8 0.000 0.000 0.000 0.000 0.000 0.000 11.48 & 620.9 "1524 " 58.93 $ 86.38 & [ ] 8
9 0.000 0.000 0.000 0.000 0.000 0.000 36.84 & 543.4 "1514 " 56.30 $ 265.0 " [ ] 9
10 0.000 0.000 0.000 0.000 0.000 0.000 44.30 $1182 " 964.8 " 56.98 # 147.6 " [ ] 10
11 0.000 0.000 0.000 0.000 0.000 0.000 35.20 $1523 " 741.4 " 55.85 $ 102.2 # [ ] 11
12 0.000 0.000 0.000 0.000 0.000 0.000 35.71 $2627 " 592.6 " 50.28 $ [ ] [ ] 12
13 0.000 0.000 0.000 0.000 0.000 0.000 38.06 $2515 " 489.7 " 44.40 $ [ ] [ ] 13
14 0.000 0.000 0.000 0.000 0.000 0.000 37.83 $1911 " 429.7 " 39.90 $ [ ] [ ] 14
15 0.000 0.000 0.000 0.000 0.000 0.000 36.09 $1480 " 426.8 " 34.99 $ [ ] [ ] 15
16 0.000 0.000 0.000 0.000 0.000 0.000 40.62 $1118 " 436.0 " 32.36 $ [ ] [ ] 16
17 0.000 0.000 0.000 0.000 0.000 0.000 44.99 $1026 " 618.9 " 28.51 & [ ] [ ] 17
18 0.000 0.000 0.000 0.000 0.000 0.000 48.68 $ 769.4 " 691.4 " 24.53 & [ ] [ ] 18
19 0.000 0.000 0.000 0.000 0.000 0.000 48.63 $ 597.7 " 545.1 " 22.07 & [ ] [ ] 19
20 0.000 0.000 0.000 0.000 0.000 0.000 53.97 $ 627.9 " 480.7 " 33.85 & [ ] [ ] 20
21 0.000 0.000 0.000 0.000 0.000 0.000 43.89 $ 901.1 " 436.8 " 28.72 & [ ] [ ] 21
22 0.000 0.000 0.000 0.000 0.000 0.000 42.25 $2179 " 367.0 " 37.42 & [ ] [ ] 22
23 0.000 0.000 0.000 0.000 0.000 0.000 48.33 $2106 " 304.5 " 30.64 & [ ] [ ] 23
24 0.000 0.000 0.000 0.000 0.000 0.000 59.23 $1499 " 264.3 " 27.33 & [ ] [ ] 24
25 0.000 0.000 0.000 0.000 0.000 0.000 87.11 #1431 " 228.4 " 28.61 & [ ] [ ] 25
26 0.000 0.000 0.000 0.000 0.000 0.000 257.3 "2365 " 197.5 " 30.78 & [ ] [ ] 26
27 0.000 0.000 0.000 0.000 0.000 0.000 621.5 "5023 " 170.9 " 27.79 & [ ] [ ] 27
28 0.000 0.000 0.000 0.000 0.000 0.000 541.1 "3930 " 150.3 " 22.76 & [ ] [ ] 28
29 0.000 0.000 0.000 0.000 0.000 463.7 "2482 " 131.6 " 18.54 & [ ] [ ] 29
30 0.000 0.000 0.000 0.000 0.000 415.2 "1707 " 114.3 " 16.13 & [ ] [ ] 30
31 0.000 0.000 0.000 426.8 "1294 " 14.35 & [ ] 31
Mean 0.000 0.000 0.000 0.000 0.000 0.000 114.3 &1445 " 549.0 " 44.45 & 61.47 & [ ]
Median 0.000 0.000 0.000 0.000 0.000 0.000 42.25 &1182 " 486.4 " 34.99 & 11.55 & [ ]
Maximum 0.000 0.000 0.000 0.000 0.000 0.000 621.5 &5023 "1524 " 102.2 & 265.0 & [ ]
Minimum 0.000 0.000 0.000 0.000 0.000 0.000 0.000& 245.7 " 114.3 " 14.35 & 7.066& [ ]
Total 0.00 0.00 0.00 0.00 0.00 0.00 3543 &44792 "16470 " 1378 & 676.2 & [ ]
Missing Days 0 0 0 0 0 0 0 0 0 0 19 31
Summaries ------------------ Notes -------------------
--------- All recorded data is continuous and reliable
except where the following tags are used...
Annual Mean 212.3 & " ... Relative Uncertainty +/-10%
Ann. Median 0.000& # ... Relative Uncertainty +/-15%
Annual Total 66859 & $ ... Relative Uncertainty +/-20%
Missing Days 50 & ... Relative Uncertainty +/-30%
[ ... Not Available
Maximum Minimum
Daily 5023 & 0.000&